diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/api/Azure.AI.TextAnalytics.netstandard2.0.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/api/Azure.AI.TextAnalytics.netstandard2.0.cs
index f33f265cfc7b9..23306cab043d6 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/api/Azure.AI.TextAnalytics.netstandard2.0.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/api/Azure.AI.TextAnalytics.netstandard2.0.cs
@@ -138,6 +138,7 @@ public partial class EntitiesTaskParameters
     {
         public EntitiesTaskParameters() { }
         public string ModelVersion { get { throw null; } set { } }
+        public Azure.AI.TextAnalytics.StringIndexType StringIndexType { get { throw null; } set { } }
     }
     public partial class Entity
     {
@@ -367,6 +368,7 @@ public partial class PiiTaskParameters
         public PiiTaskParameters() { }
         public Azure.AI.TextAnalytics.PiiTaskParametersDomain? Domain { get { throw null; } set { } }
         public string ModelVersion { get { throw null; } set { } }
+        public Azure.AI.TextAnalytics.StringIndexType StringIndexType { get { throw null; } set { } }
     }
     [System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
     public readonly partial struct PiiTaskParametersDomain : System.IEquatable<Azure.AI.TextAnalytics.PiiTaskParametersDomain>
@@ -448,6 +450,25 @@ internal SentimentConfidenceScores() { }
         public double Neutral { get { throw null; } }
         public double Positive { get { throw null; } }
     }
+    [System.Runtime.InteropServices.StructLayoutAttribute(System.Runtime.InteropServices.LayoutKind.Sequential)]
+    public readonly partial struct StringIndexType : System.IEquatable<Azure.AI.TextAnalytics.StringIndexType>
+    {
+        private readonly object _dummy;
+        private readonly int _dummyPrimitive;
+        public StringIndexType(string value) { throw null; }
+        public static Azure.AI.TextAnalytics.StringIndexType TextElementsV8 { get { throw null; } }
+        public static Azure.AI.TextAnalytics.StringIndexType UnicodeCodePoint { get { throw null; } }
+        public static Azure.AI.TextAnalytics.StringIndexType Utf16CodeUnit { get { throw null; } }
+        public bool Equals(Azure.AI.TextAnalytics.StringIndexType other) { throw null; }
+        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+        public override bool Equals(object obj) { throw null; }
+        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+        public override int GetHashCode() { throw null; }
+        public static bool operator ==(Azure.AI.TextAnalytics.StringIndexType left, Azure.AI.TextAnalytics.StringIndexType right) { throw null; }
+        public static implicit operator Azure.AI.TextAnalytics.StringIndexType (string value) { throw null; }
+        public static bool operator !=(Azure.AI.TextAnalytics.StringIndexType left, Azure.AI.TextAnalytics.StringIndexType right) { throw null; }
+        public override string ToString() { throw null; }
+    }
     public partial class TasksStateTasksDetails : Azure.AI.TextAnalytics.TaskState
     {
         internal TasksStateTasksDetails() { }
@@ -643,6 +664,7 @@ public partial class TextAnalyticsRequestOptions
         public TextAnalyticsRequestOptions() { }
         public bool IncludeStatistics { get { throw null; } set { } }
         public string ModelVersion { get { throw null; } set { } }
+        public Azure.AI.TextAnalytics.StringIndexType StringIndexType { get { throw null; } set { } }
     }
     public partial class TextAnalyticsResult
     {
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/EntitiesTaskParameters.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/EntitiesTaskParameters.cs
index e774a8efc5a62..7210f689d164a 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/EntitiesTaskParameters.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/EntitiesTaskParameters.cs
@@ -20,6 +20,6 @@ public partial class EntitiesTaskParameters
         /// <summary>
         /// StringIndexType
         /// </summary>
-        internal StringIndexType? StringIndexType { get; set; }
+        public StringIndexType StringIndexType { get; set; } = StringIndexType.Utf16CodeUnit;
     }
 }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobMetadata.Serialization.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobMetadata.Serialization.cs
new file mode 100644
index 0000000000000..21c7ed22edbdb
--- /dev/null
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobMetadata.Serialization.cs
@@ -0,0 +1,66 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using System.Text.Json;
+using Azure.AI.TextAnalytics;
+using Azure.Core;
+
+namespace Azure.AI.TextAnalytics.Models
+{
+    internal partial class AnalyzeJobMetadata
+    {
+        internal static AnalyzeJobMetadata DeserializeAnalyzeJobMetadata(JsonElement element)
+        {
+            Optional<string> displayName = default;
+            DateTimeOffset createdDateTime = default;
+            Optional<DateTimeOffset> expirationDateTime = default;
+            string jobId = default;
+            DateTimeOffset lastUpdateDateTime = default;
+            JobStatus status = default;
+            foreach (var property in element.EnumerateObject())
+            {
+                if (property.NameEquals("displayName"))
+                {
+                    displayName = property.Value.GetString();
+                    continue;
+                }
+                if (property.NameEquals("createdDateTime"))
+                {
+                    createdDateTime = property.Value.GetDateTimeOffset("O");
+                    continue;
+                }
+                if (property.NameEquals("expirationDateTime"))
+                {
+                    if (property.Value.ValueKind == JsonValueKind.Null)
+                    {
+                        property.ThrowNonNullablePropertyIsNull();
+                        continue;
+                    }
+                    expirationDateTime = property.Value.GetDateTimeOffset("O");
+                    continue;
+                }
+                if (property.NameEquals("jobId"))
+                {
+                    jobId = property.Value.GetString();
+                    continue;
+                }
+                if (property.NameEquals("lastUpdateDateTime"))
+                {
+                    lastUpdateDateTime = property.Value.GetDateTimeOffset("O");
+                    continue;
+                }
+                if (property.NameEquals("status"))
+                {
+                    status = new JobStatus(property.Value.GetString());
+                    continue;
+                }
+            }
+            return new AnalyzeJobMetadata(createdDateTime, Optional.ToNullable(expirationDateTime), jobId, lastUpdateDateTime, status, displayName.Value);
+        }
+    }
+}
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobMetadata.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobMetadata.cs
new file mode 100644
index 0000000000000..7650c4bc5f2d6
--- /dev/null
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobMetadata.cs
@@ -0,0 +1,44 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+// <auto-generated/>
+
+#nullable disable
+
+using System;
+using Azure.AI.TextAnalytics;
+
+namespace Azure.AI.TextAnalytics.Models
+{
+    /// <summary> The AnalyzeJobMetadata. </summary>
+    internal partial class AnalyzeJobMetadata : JobMetadata
+    {
+        /// <summary> Initializes a new instance of AnalyzeJobMetadata. </summary>
+        /// <param name="createdDateTime"> . </param>
+        /// <param name="jobId"> . </param>
+        /// <param name="lastUpdateDateTime"> . </param>
+        /// <param name="status"> . </param>
+        /// <exception cref="ArgumentNullException"> <paramref name="jobId"/> is null. </exception>
+        internal AnalyzeJobMetadata(DateTimeOffset createdDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status) : base(createdDateTime, jobId, lastUpdateDateTime, status)
+        {
+            if (jobId == null)
+            {
+                throw new ArgumentNullException(nameof(jobId));
+            }
+        }
+
+        /// <summary> Initializes a new instance of AnalyzeJobMetadata. </summary>
+        /// <param name="createdDateTime"> . </param>
+        /// <param name="expirationDateTime"> . </param>
+        /// <param name="jobId"> . </param>
+        /// <param name="lastUpdateDateTime"> . </param>
+        /// <param name="status"> . </param>
+        /// <param name="displayName"> . </param>
+        internal AnalyzeJobMetadata(DateTimeOffset createdDateTime, DateTimeOffset? expirationDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status, string displayName) : base(createdDateTime, expirationDateTime, jobId, lastUpdateDateTime, status)
+        {
+            DisplayName = displayName;
+        }
+
+        public string DisplayName { get; }
+    }
+}
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.Serialization.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.Serialization.cs
index 61233a43d43ab..9d3f903f9f16d 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.Serialization.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.Serialization.cs
@@ -21,8 +21,8 @@ internal static AnalyzeJobState DeserializeAnalyzeJobState(JsonElement element)
             Optional<TextDocumentBatchStatistics> statistics = default;
             AnalyzeTasks tasks = default;
             Optional<string> nextLink = default;
-            DateTimeOffset createdDateTime = default;
             Optional<string> displayName = default;
+            DateTimeOffset createdDateTime = default;
             Optional<DateTimeOffset> expirationDateTime = default;
             string jobId = default;
             DateTimeOffset lastUpdateDateTime = default;
@@ -64,14 +64,14 @@ internal static AnalyzeJobState DeserializeAnalyzeJobState(JsonElement element)
                     nextLink = property.Value.GetString();
                     continue;
                 }
-                if (property.NameEquals("createdDateTime"))
+                if (property.NameEquals("displayName"))
                 {
-                    createdDateTime = property.Value.GetDateTimeOffset("O");
+                    displayName = property.Value.GetString();
                     continue;
                 }
-                if (property.NameEquals("displayName"))
+                if (property.NameEquals("createdDateTime"))
                 {
-                    displayName = property.Value.GetString();
+                    createdDateTime = property.Value.GetDateTimeOffset("O");
                     continue;
                 }
                 if (property.NameEquals("expirationDateTime"))
@@ -100,7 +100,7 @@ internal static AnalyzeJobState DeserializeAnalyzeJobState(JsonElement element)
                     continue;
                 }
             }
-            return new AnalyzeJobState(createdDateTime, displayName.Value, Optional.ToNullable(expirationDateTime), jobId, lastUpdateDateTime, status, Optional.ToList(errors), statistics.Value, tasks, nextLink.Value);
+            return new AnalyzeJobState(createdDateTime, Optional.ToNullable(expirationDateTime), jobId, lastUpdateDateTime, status, displayName.Value, Optional.ToList(errors), statistics.Value, tasks, nextLink.Value);
         }
     }
 }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.cs
index d538fd291a134..c95750c2019f3 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/AnalyzeJobState.cs
@@ -13,7 +13,7 @@
 namespace Azure.AI.TextAnalytics.Models
 {
     /// <summary> The AnalyzeJobState. </summary>
-    internal partial class AnalyzeJobState : JobMetadata
+    internal partial class AnalyzeJobState : AnalyzeJobMetadata
     {
         /// <summary> Initializes a new instance of AnalyzeJobState. </summary>
         /// <param name="createdDateTime"> . </param>
@@ -39,16 +39,16 @@ internal AnalyzeJobState(DateTimeOffset createdDateTime, string jobId, DateTimeO
 
         /// <summary> Initializes a new instance of AnalyzeJobState. </summary>
         /// <param name="createdDateTime"> . </param>
-        /// <param name="displayName"> . </param>
         /// <param name="expirationDateTime"> . </param>
         /// <param name="jobId"> . </param>
         /// <param name="lastUpdateDateTime"> . </param>
         /// <param name="status"> . </param>
+        /// <param name="displayName"> . </param>
         /// <param name="errors"> . </param>
         /// <param name="statistics"> if showStats=true was specified in the request this field will contain information about the request payload. </param>
         /// <param name="tasks"> . </param>
         /// <param name="nextLink"> . </param>
-        internal AnalyzeJobState(DateTimeOffset createdDateTime, string displayName, DateTimeOffset? expirationDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status, IReadOnlyList<TextAnalyticsErrorInternal> errors, TextDocumentBatchStatistics statistics, AnalyzeTasks tasks, string nextLink) : base(createdDateTime, displayName, expirationDateTime, jobId, lastUpdateDateTime, status)
+        internal AnalyzeJobState(DateTimeOffset createdDateTime, DateTimeOffset? expirationDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status, string displayName, IReadOnlyList<TextAnalyticsErrorInternal> errors, TextDocumentBatchStatistics statistics, AnalyzeTasks tasks, string nextLink) : base(createdDateTime, expirationDateTime, jobId, lastUpdateDateTime, status, displayName)
         {
             Errors = errors;
             Statistics = statistics;
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.Serialization.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.Serialization.cs
index d032996d58f58..3021b8373bdb8 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.Serialization.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.Serialization.cs
@@ -23,7 +23,7 @@ void IUtf8JsonSerializable.Write(Utf8JsonWriter writer)
             if (Optional.IsDefined(StringIndexType))
             {
                 writer.WritePropertyName("stringIndexType");
-                writer.WriteStringValue(StringIndexType.Value.ToString());
+                writer.WriteStringValue(StringIndexType.ToString());
             }
             writer.WriteEndObject();
         }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.cs
index 3069009c1086c..975b71dbb5bd2 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/EntitiesTaskParameters.cs
@@ -5,8 +5,6 @@
 
 #nullable disable
 
-using Azure.AI.TextAnalytics.Models;
-
 namespace Azure.AI.TextAnalytics
 {
     /// <summary> The EntitiesTaskParameters. </summary>
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.Serialization.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.Serialization.cs
index 3a67696dc14cb..42cea12ef73f0 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.Serialization.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.Serialization.cs
@@ -21,7 +21,6 @@ internal static HealthcareJobState DeserializeHealthcareJobState(JsonElement ele
             Optional<IReadOnlyList<TextAnalyticsErrorInternal>> errors = default;
             Optional<string> nextLink = default;
             DateTimeOffset createdDateTime = default;
-            Optional<string> displayName = default;
             Optional<DateTimeOffset> expirationDateTime = default;
             string jobId = default;
             DateTimeOffset lastUpdateDateTime = default;
@@ -63,11 +62,6 @@ internal static HealthcareJobState DeserializeHealthcareJobState(JsonElement ele
                     createdDateTime = property.Value.GetDateTimeOffset("O");
                     continue;
                 }
-                if (property.NameEquals("displayName"))
-                {
-                    displayName = property.Value.GetString();
-                    continue;
-                }
                 if (property.NameEquals("expirationDateTime"))
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
@@ -94,7 +88,7 @@ internal static HealthcareJobState DeserializeHealthcareJobState(JsonElement ele
                     continue;
                 }
             }
-            return new HealthcareJobState(createdDateTime, displayName.Value, Optional.ToNullable(expirationDateTime), jobId, lastUpdateDateTime, status, results.Value, Optional.ToList(errors), nextLink.Value);
+            return new HealthcareJobState(createdDateTime, Optional.ToNullable(expirationDateTime), jobId, lastUpdateDateTime, status, results.Value, Optional.ToList(errors), nextLink.Value);
         }
     }
 }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.cs
index b14ea28f1e1c2..1f87d9a47c58b 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/HealthcareJobState.cs
@@ -33,7 +33,6 @@ internal HealthcareJobState(DateTimeOffset createdDateTime, string jobId, DateTi
 
         /// <summary> Initializes a new instance of HealthcareJobState. </summary>
         /// <param name="createdDateTime"> . </param>
-        /// <param name="displayName"> . </param>
         /// <param name="expirationDateTime"> . </param>
         /// <param name="jobId"> . </param>
         /// <param name="lastUpdateDateTime"> . </param>
@@ -41,7 +40,7 @@ internal HealthcareJobState(DateTimeOffset createdDateTime, string jobId, DateTi
         /// <param name="results"> . </param>
         /// <param name="errors"> . </param>
         /// <param name="nextLink"> . </param>
-        internal HealthcareJobState(DateTimeOffset createdDateTime, string displayName, DateTimeOffset? expirationDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status, HealthcareResult results, IReadOnlyList<TextAnalyticsErrorInternal> errors, string nextLink) : base(createdDateTime, displayName, expirationDateTime, jobId, lastUpdateDateTime, status)
+        internal HealthcareJobState(DateTimeOffset createdDateTime, DateTimeOffset? expirationDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status, HealthcareResult results, IReadOnlyList<TextAnalyticsErrorInternal> errors, string nextLink) : base(createdDateTime, expirationDateTime, jobId, lastUpdateDateTime, status)
         {
             Results = results;
             Errors = errors;
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.Serialization.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.Serialization.cs
index 5feb7b5c8a2e7..f359f03f79a2c 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.Serialization.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.Serialization.cs
@@ -17,7 +17,6 @@ internal partial class JobMetadata
         internal static JobMetadata DeserializeJobMetadata(JsonElement element)
         {
             DateTimeOffset createdDateTime = default;
-            Optional<string> displayName = default;
             Optional<DateTimeOffset> expirationDateTime = default;
             string jobId = default;
             DateTimeOffset lastUpdateDateTime = default;
@@ -29,11 +28,6 @@ internal static JobMetadata DeserializeJobMetadata(JsonElement element)
                     createdDateTime = property.Value.GetDateTimeOffset("O");
                     continue;
                 }
-                if (property.NameEquals("displayName"))
-                {
-                    displayName = property.Value.GetString();
-                    continue;
-                }
                 if (property.NameEquals("expirationDateTime"))
                 {
                     if (property.Value.ValueKind == JsonValueKind.Null)
@@ -60,7 +54,7 @@ internal static JobMetadata DeserializeJobMetadata(JsonElement element)
                     continue;
                 }
             }
-            return new JobMetadata(createdDateTime, displayName.Value, Optional.ToNullable(expirationDateTime), jobId, lastUpdateDateTime, status);
+            return new JobMetadata(createdDateTime, Optional.ToNullable(expirationDateTime), jobId, lastUpdateDateTime, status);
         }
     }
 }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.cs
index 36bce0f444be8..edfca717ac131 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/JobMetadata.cs
@@ -34,15 +34,13 @@ internal JobMetadata(DateTimeOffset createdDateTime, string jobId, DateTimeOffse
 
         /// <summary> Initializes a new instance of JobMetadata. </summary>
         /// <param name="createdDateTime"> . </param>
-        /// <param name="displayName"> . </param>
         /// <param name="expirationDateTime"> . </param>
         /// <param name="jobId"> . </param>
         /// <param name="lastUpdateDateTime"> . </param>
         /// <param name="status"> . </param>
-        internal JobMetadata(DateTimeOffset createdDateTime, string displayName, DateTimeOffset? expirationDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status)
+        internal JobMetadata(DateTimeOffset createdDateTime, DateTimeOffset? expirationDateTime, string jobId, DateTimeOffset lastUpdateDateTime, JobStatus status)
         {
             CreatedDateTime = createdDateTime;
-            DisplayName = displayName;
             ExpirationDateTime = expirationDateTime;
             JobId = jobId;
             LastUpdateDateTime = lastUpdateDateTime;
@@ -50,7 +48,6 @@ internal JobMetadata(DateTimeOffset createdDateTime, string displayName, DateTim
         }
 
         public DateTimeOffset CreatedDateTime { get; }
-        public string DisplayName { get; }
         public DateTimeOffset? ExpirationDateTime { get; }
         public DateTimeOffset LastUpdateDateTime { get; }
         public JobStatus Status { get; }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.Serialization.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.Serialization.cs
index 3405f6b5dd65e..613b41bdebd20 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.Serialization.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.Serialization.cs
@@ -28,7 +28,7 @@ void IUtf8JsonSerializable.Write(Utf8JsonWriter writer)
             if (Optional.IsDefined(StringIndexType))
             {
                 writer.WritePropertyName("stringIndexType");
-                writer.WriteStringValue(StringIndexType.Value.ToString());
+                writer.WriteStringValue(StringIndexType.ToString());
             }
             writer.WriteEndObject();
         }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.cs
index a8a6e5b5e6b65..44c26dcf99ff1 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/PiiTaskParameters.cs
@@ -5,8 +5,6 @@
 
 #nullable disable
 
-using Azure.AI.TextAnalytics.Models;
-
 namespace Azure.AI.TextAnalytics
 {
     /// <summary> The PiiTaskParameters. </summary>
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/StringIndexType.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/StringIndexType.cs
index 2a94f328d2f70..e2257f9533dae 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/StringIndexType.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/Generated/Models/StringIndexType.cs
@@ -8,10 +8,10 @@
 using System;
 using System.ComponentModel;
 
-namespace Azure.AI.TextAnalytics.Models
+namespace Azure.AI.TextAnalytics
 {
     /// <summary> The StringIndexType. </summary>
-    internal readonly partial struct StringIndexType : IEquatable<StringIndexType>
+    public readonly partial struct StringIndexType : IEquatable<StringIndexType>
     {
         private readonly string _value;
 
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/PiiTaskParameters.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/PiiTaskParameters.cs
index 6ac89e913ab30..319fd83e4fce3 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/PiiTaskParameters.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/PiiTaskParameters.cs
@@ -20,7 +20,7 @@ public partial class PiiTaskParameters
         /// <summary>
         /// StringIndexType
         /// </summary>
-        internal StringIndexType? StringIndexType { get; set; }
+        public StringIndexType StringIndexType { get; set; } = StringIndexType.Utf16CodeUnit;
 
         /// <summary>
         /// PiiTaskParametersDomain
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/StringIndexType.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/StringIndexType.cs
index c8f0fa5014180..204a192ff0b0b 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/StringIndexType.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/StringIndexType.cs
@@ -3,10 +3,10 @@
 
 using Azure.Core;
 
-namespace Azure.AI.TextAnalytics.Models
+namespace Azure.AI.TextAnalytics
 {
     [CodeGenModel("StringIndexType")]
-    internal partial struct StringIndexType
+    public partial struct StringIndexType
     {
     }
 }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsClient.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsClient.cs
index 2974a73956590..41bceef3d5ee6 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsClient.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsClient.cs
@@ -25,9 +25,6 @@ public class TextAnalyticsClient
         private readonly string DefaultCognitiveScope = "https://cognitiveservices.azure.com/.default";
         private const string AuthorizationHeader = "Ocp-Apim-Subscription-Key";
 
-        // Specifies the method used to interpret string offsets. Default to <see cref="StringIndexType.Utf16CodeUnit"/>.
-        private readonly StringIndexType _stringCodeUnit = StringIndexType.Utf16CodeUnit;
-
         /// <summary>
         /// Protected constructor to allow mocking.
         /// </summary>
@@ -426,7 +423,7 @@ public virtual async Task<Response<CategorizedEntityCollection>> RecognizeEntiti
 
                 Response<EntitiesResult> result = await _serviceRestClient.EntitiesRecognitionGeneralAsync(
                     new MultiLanguageBatchInput(documents),
-                    stringIndexType: _stringCodeUnit,
+                    stringIndexType: StringIndexType.Utf16CodeUnit,
                     cancellationToken: cancellationToken).ConfigureAwait(false);
                 Response response = result.GetRawResponse();
 
@@ -484,7 +481,7 @@ public virtual Response<CategorizedEntityCollection> RecognizeEntities(string do
 
                 Response<EntitiesResult> result = _serviceRestClient.EntitiesRecognitionGeneral(
                     new MultiLanguageBatchInput(documents),
-                    stringIndexType: _stringCodeUnit,
+                    stringIndexType: StringIndexType.Utf16CodeUnit,
                     cancellationToken: cancellationToken);
                 Response response = result.GetRawResponse();
 
@@ -649,7 +646,7 @@ private async Task<Response<RecognizeEntitiesResultCollection>> RecognizeEntitie
                     batchInput,
                     options.ModelVersion,
                     options.IncludeStatistics,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken).ConfigureAwait(false);
                 var response = result.GetRawResponse();
 
@@ -675,7 +672,7 @@ private Response<RecognizeEntitiesResultCollection> RecognizeEntitiesBatch(Multi
                     batchInput,
                     options.ModelVersion,
                     options.IncludeStatistics,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken);
                 var response = result.GetRawResponse();
 
@@ -739,7 +736,7 @@ public virtual async Task<Response<PiiEntityCollection>> RecognizePiiEntitiesAsy
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.DomainFilter.GetString(),
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken: cancellationToken).ConfigureAwait(false);
                 Response response = result.GetRawResponse();
 
@@ -804,7 +801,7 @@ public virtual Response<PiiEntityCollection> RecognizePiiEntities(string documen
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.DomainFilter.GetString(),
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken: cancellationToken);
                 Response response = result.GetRawResponse();
 
@@ -970,7 +967,7 @@ private async Task<Response<RecognizePiiEntitiesResultCollection>> RecognizePiiE
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.DomainFilter.GetString(),
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken).ConfigureAwait(false);
                 var response = result.GetRawResponse();
 
@@ -997,7 +994,7 @@ private Response<RecognizePiiEntitiesResultCollection> RecognizePiiEntitiesBatch
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.DomainFilter.GetString(),
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken);
                 var response = result.GetRawResponse();
 
@@ -1111,7 +1108,7 @@ public virtual async Task<Response<DocumentSentiment>> AnalyzeSentimentAsync(str
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.IncludeOpinionMining,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken).ConfigureAwait(false);
                 Response response = result.GetRawResponse();
 
@@ -1171,7 +1168,7 @@ public virtual Response<DocumentSentiment> AnalyzeSentiment(string document, str
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.IncludeOpinionMining,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken);
                 Response response = result.GetRawResponse();
 
@@ -1447,7 +1444,7 @@ private async Task<Response<AnalyzeSentimentResultCollection>> AnalyzeSentimentB
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.IncludeOpinionMining,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken).ConfigureAwait(false);
                 var response = result.GetRawResponse();
 
@@ -1474,7 +1471,7 @@ private Response<AnalyzeSentimentResultCollection> AnalyzeSentimentBatch(MultiLa
                     options.ModelVersion,
                     options.IncludeStatistics,
                     options.IncludeOpinionMining,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken);
                 var response = result.GetRawResponse();
 
@@ -1811,7 +1808,7 @@ public virtual async Task<Response<LinkedEntityCollection>> RecognizeLinkedEntit
 
                 Response<EntityLinkingResult> result = await _serviceRestClient.EntitiesLinkingAsync(
                     new MultiLanguageBatchInput(documents),
-                    stringIndexType: _stringCodeUnit,
+                    stringIndexType: StringIndexType.Utf16CodeUnit,
                     cancellationToken: cancellationToken).ConfigureAwait(false);
                 Response response = result.GetRawResponse();
 
@@ -1867,7 +1864,7 @@ public virtual Response<LinkedEntityCollection> RecognizeLinkedEntities(string d
 
                 Response<EntityLinkingResult> result = _serviceRestClient.EntitiesLinking(
                     new MultiLanguageBatchInput(documents),
-                    stringIndexType: _stringCodeUnit,
+                    stringIndexType: StringIndexType.Utf16CodeUnit,
                     cancellationToken: cancellationToken);
                 Response response = result.GetRawResponse();
 
@@ -2024,7 +2021,7 @@ private async Task<Response<RecognizeLinkedEntitiesResultCollection>> RecognizeL
                     batchInput,
                     options.ModelVersion,
                     options.IncludeStatistics,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken).ConfigureAwait(false);
                 var response = result.GetRawResponse();
 
@@ -2049,7 +2046,7 @@ private Response<RecognizeLinkedEntitiesResultCollection> RecognizeLinkedEntitie
                 Response<EntityLinkingResult> result = _serviceRestClient.EntitiesLinking(batchInput,
                     options.ModelVersion,
                     options.IncludeStatistics,
-                    _stringCodeUnit,
+                    options.StringIndexType,
                     cancellationToken);
                 var response = result.GetRawResponse();
 
@@ -2103,7 +2100,7 @@ public virtual async Task<HealthcareOperation> StartHealthcareAsync(string docum
 
             try
             {
-                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = await _serviceRestClient.HealthAsync(documentInputs, options.ModelVersion, _stringCodeUnit, cancellationToken).ConfigureAwait(false);
+                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = await _serviceRestClient.HealthAsync(documentInputs, options.ModelVersion, options.StringIndexType, cancellationToken).ConfigureAwait(false);
                 string location = response.Headers.OperationLocation;
 
                 IDictionary<string, int> idToIndexMap = CreateIdToIndexMap(documentInputs.Documents);
@@ -2152,7 +2149,7 @@ public virtual HealthcareOperation StartHealthcare(string document, string langu
 
             try
             {
-                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = _serviceRestClient.Health(documentInputs, options.ModelVersion, _stringCodeUnit, cancellationToken);
+                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = _serviceRestClient.Health(documentInputs, options.ModelVersion, options.StringIndexType, cancellationToken);
                 string location = response.Headers.OperationLocation;
 
                 IDictionary<string, int> idToIndexMap = CreateIdToIndexMap(documentInputs.Documents);
@@ -2302,7 +2299,7 @@ private HealthcareOperation StartHealthcareBatch(MultiLanguageBatchInput batchIn
 
             try
             {
-                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = _serviceRestClient.Health(batchInput, options.ModelVersion, _stringCodeUnit, cancellationToken);
+                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = _serviceRestClient.Health(batchInput, options.ModelVersion, options.StringIndexType, cancellationToken);
                 string location = response.Headers.OperationLocation;
 
                 var _idToIndexMap = CreateIdToIndexMap(batchInput.Documents);
@@ -2325,7 +2322,7 @@ private async Task<HealthcareOperation> StartHealthcareBatchAsync(MultiLanguageB
 
             try
             {
-                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = await _serviceRestClient.HealthAsync(batchInput, options.ModelVersion, _stringCodeUnit, cancellationToken).ConfigureAwait(false);
+                ResponseWithHeaders<TextAnalyticsHealthHeaders> response = await _serviceRestClient.HealthAsync(batchInput, options.ModelVersion, options.StringIndexType, cancellationToken).ConfigureAwait(false);
                 string location = response.Headers.OperationLocation;
 
                 var _idToIndexMap = CreateIdToIndexMap(batchInput.Documents);
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsRequestOptions.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsRequestOptions.cs
index 89641d571c050..f54f645597d5b 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsRequestOptions.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/TextAnalyticsRequestOptions.cs
@@ -40,5 +40,10 @@ internal TextAnalyticsRequestOptions(bool includeStatistics, string modelVersion
         /// <a href="https://docs.microsoft.com/azure/cognitive-services/text-analytics/how-tos/text-analytics-how-to-sentiment-analysis#model-versioning"/>.
         /// </summary>
         public string ModelVersion { get; set; }
+
+        /// <summary>
+        /// StringIndexType
+        /// </summary>
+        public StringIndexType StringIndexType { get; set; } = StringIndexType.Utf16CodeUnit;
     }
 }
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/src/autorest.md b/sdk/textanalytics/Azure.AI.TextAnalytics/src/autorest.md
index 727b220d0e6e9..8ef01c293b05b 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/src/autorest.md
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/src/autorest.md
@@ -7,7 +7,7 @@ Run `dotnet build /t:GenerateCode` to generate code.
 
 ``` yaml
 input-file:
-    -  https://github.com/Azure/azure-rest-api-specs/blob/9b2689fe79302577b843f1cdf40f42330a67de08/specification/cognitiveservices/data-plane/TextAnalytics/preview/v3.1-preview.3/TextAnalytics.json
+    -  https://github.com/Azure/azure-rest-api-specs/blob/a5dcb30f776c3f07e937912a9a163b2ec2bbbef8/specification/cognitiveservices/data-plane/TextAnalytics/preview/v3.1-preview.3/TextAnalytics.json
 ```
 
 ### Make generated models internal by default
@@ -47,4 +47,4 @@ directive:
   transform: >
     $.properties.id["x-nullable"] = true;
     $.properties.text["x-nullable"] = true;
-```
\ No newline at end of file
+```
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomain.json b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomain.json
index 48d45ccb15f73..e5f40088b2e2a 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomain.json
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomain.json
@@ -1,21 +1,14 @@
 {
   "Entries": [
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
       "RequestMethod": "POST",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
-        "Content-Length": "311",
+        "Accept": "application/json, text/json",
+        "Content-Length": "345",
         "Content-Type": "application/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "traceparent": "00-885370a4ee7b5f44bc1b2308111a366c-d528849736b05e4b-00",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "cfe8e2f8ee3911d883f149c5ba708a25",
         "x-ms-return-client-request-id": "true"
       },
@@ -34,7 +27,8 @@
             {
               "parameters": {
                 "domain": "phi",
-                "model-version": "latest"
+                "model-version": "latest",
+                "stringIndexType": "Utf16CodeUnit"
               }
             }
           ]
@@ -43,55 +37,49 @@
       },
       "StatusCode": 202,
       "ResponseHeaders": {
-        "apim-request-id": "57ec227e-4183-4165-8d39-f5b4092d840b",
-        "Date": "Tue, 17 Nov 2020 20:07:57 GMT",
-        "operation-location": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
+        "apim-request-id": "7f73f573-6055-4476-9530-e4127ad48983",
+        "Date": "Fri, 15 Jan 2021 21:56:52 GMT",
+        "operation-location": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "201"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "218"
       },
       "ResponseBody": []
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "0af6547e6d21f99df5e133f9fb1abff6",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "14b8082a-8381-48fb-ada8-ed452d5d212e",
+        "apim-request-id": "6e4fdde9-1a50-4b41-b6a0-33b378731d71",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:07:57 GMT",
+        "Date": "Fri, 15 Jan 2021 21:56:52 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "14"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "25"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithPHIDomain",
-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
-        "createdDateTime": "2020-11-17T20:07:57Z",
-        "expirationDateTime": "2020-11-18T20:07:57Z",
+        "jobId": "33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:56:52Z",
+        "createdDateTime": "2021-01-15T21:56:52Z",
+        "expirationDateTime": "2021-01-16T21:56:52Z",
         "status": "notStarted",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
+            "lastUpdateDateTime": "2021-01-15T21:56:52Z"
           },
           "completed": 0,
           "failed": 0,
@@ -101,44 +89,38 @@
       }
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "1ffe04ae50f965a11f4bc1da8e14f022",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "171bad8a-4326-413d-8ba8-74cd5c054a42",
+        "apim-request-id": "0dfddc63-7296-4e49-b754-3ef1fc4f1b67",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:07:58 GMT",
+        "Date": "Fri, 15 Jan 2021 21:56:54 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "68"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "71"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithPHIDomain",
-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
-        "createdDateTime": "2020-11-17T20:07:57Z",
-        "expirationDateTime": "2020-11-18T20:07:57Z",
-        "status": "notStarted",
+        "jobId": "33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:56:53Z",
+        "createdDateTime": "2021-01-15T21:56:52Z",
+        "expirationDateTime": "2021-01-16T21:56:52Z",
+        "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
+            "lastUpdateDateTime": "2021-01-15T21:56:53Z"
           },
           "completed": 0,
           "failed": 0,
@@ -148,44 +130,38 @@
       }
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "1647a062e0a88b5844efda57badf1569",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "6a4323aa-2ae2-43a1-8df1-d864e1d88ee9",
+        "apim-request-id": "c29810ab-5fbc-4729-be35-22bf40744ab7",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:07:59 GMT",
+        "Date": "Fri, 15 Jan 2021 21:56:55 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "79"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "75"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithPHIDomain",
-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
-        "createdDateTime": "2020-11-17T20:07:57Z",
-        "expirationDateTime": "2020-11-18T20:07:57Z",
+        "jobId": "33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:56:53Z",
+        "createdDateTime": "2021-01-15T21:56:52Z",
+        "expirationDateTime": "2021-01-16T21:56:52Z",
         "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
+            "lastUpdateDateTime": "2021-01-15T21:56:53Z"
           },
           "completed": 0,
           "failed": 0,
@@ -195,44 +171,38 @@
       }
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "b61653316b722e2cb391ead5abc26ae0",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "1c369837-268d-46bf-ad20-310f63e77c7c",
+        "apim-request-id": "40b7e88d-09b4-4a54-a7ec-984346523e1b",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:08:01 GMT",
+        "Date": "Fri, 15 Jan 2021 21:56:57 GMT",
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       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
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       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "af2c2889-6f08-4d77-81c3-cfa070ff8048",
+        "apim-request-id": "7957c353-60c0-4442-b31f-75b2ce2580d0",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:09:59 GMT",
+        "Date": "Fri, 15 Jan 2021 21:58:54 GMT",
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         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "78"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "45"
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       "ResponseBody": {
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-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
-        "createdDateTime": "2020-11-17T20:07:57Z",
-        "expirationDateTime": "2020-11-18T20:07:57Z",
+        "jobId": "33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:56:53Z",
+        "createdDateTime": "2021-01-15T21:56:52Z",
+        "expirationDateTime": "2021-01-16T21:56:52Z",
         "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
+            "lastUpdateDateTime": "2021-01-15T21:56:53Z"
           },
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           "failed": 0,
@@ -4754,44 +4148,38 @@
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+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000?showStats=false",
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       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
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-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
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+        "apim-request-id": "4b17d388-cadb-44c6-9062-438ce2582d79",
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-        "Date": "Tue, 17 Nov 2020 20:10:00 GMT",
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         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "60"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "62"
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         "displayName": "AnalyzeOperationWithPHIDomain",
-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
-        "createdDateTime": "2020-11-17T20:07:57Z",
-        "expirationDateTime": "2020-11-18T20:07:57Z",
+        "jobId": "33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:56:53Z",
+        "createdDateTime": "2021-01-15T21:56:52Z",
+        "expirationDateTime": "2021-01-16T21:56:52Z",
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             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
+            "lastUpdateDateTime": "2021-01-15T21:56:53Z"
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@@ -4801,44 +4189,38 @@
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+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000?showStats=false",
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       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
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-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
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       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "df800e46-2f30-434a-84e8-476bf70ed251",
+        "apim-request-id": "98ba3804-3284-4b4b-a440-93692f42f1ef",
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-        "Date": "Tue, 17 Nov 2020 20:10:01 GMT",
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         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "38"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "63"
       },
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         "displayName": "AnalyzeOperationWithPHIDomain",
-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
-        "createdDateTime": "2020-11-17T20:07:57Z",
-        "expirationDateTime": "2020-11-18T20:07:57Z",
+        "jobId": "33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:56:53Z",
+        "createdDateTime": "2021-01-15T21:56:52Z",
+        "expirationDateTime": "2021-01-16T21:56:52Z",
         "status": "running",
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         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
+            "lastUpdateDateTime": "2021-01-15T21:56:53Z"
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           "failed": 0,
@@ -4848,185 +4230,38 @@
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+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
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-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
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         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
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-        "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:10:02 GMT",
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-          "application/json",
-          "text/json"
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-        "apim-request-id": "80b6356c-7fa4-4f27-a89a-556944c662af",
-        "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:10:05 GMT",
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-        "X-Content-Type-Options": "nosniff",
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-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
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-        "expirationDateTime": "2020-11-18T20:07:57Z",
-        "status": "running",
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-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
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-          "total": 1
-        }
-      }
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-      "RequestMethod": "GET",
-      "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
-        "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
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-        "x-ms-return-client-request-id": "true"
-      },
-      "RequestBody": null,
-      "StatusCode": 200,
-      "ResponseHeaders": {
-        "apim-request-id": "ddd6cca3-6dbe-4ee0-8260-e870f08c975c",
+        "apim-request-id": "c16575cd-9208-42d8-9009-77126dd41bed",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:10:06 GMT",
+        "Date": "Fri, 15 Jan 2021 21:58:58 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "95"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "125"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithPHIDomain",
-        "jobId": "678c8be8-0d21-4f1c-a5d3-8c41e243dc20_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:07:57Z",
-        "createdDateTime": "2020-11-17T20:07:57Z",
-        "expirationDateTime": "2020-11-18T20:07:57Z",
+        "jobId": "33f97eb5-9568-463d-889c-3d428403bd08_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:56:53Z",
+        "createdDateTime": "2021-01-15T21:56:52Z",
+        "expirationDateTime": "2021-01-16T21:56:52Z",
         "status": "succeeded",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:07:57Z"
+            "lastUpdateDateTime": "2021-01-15T21:56:53Z"
           },
           "completed": 1,
           "failed": 0,
@@ -5035,7 +4270,7 @@
           "entityRecognitionPiiTasks": [
             {
               "name": "AnalyzeOperationWithPHIDomain",
-              "lastUpdateDateTime": "2020-11-17T20:07:57.6058526Z",
+              "lastUpdateDateTime": "2021-01-15T21:56:53.1069892Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -5073,6 +4308,6 @@
   "Variables": {
     "RandomSeed": "390387714",
     "TEXT_ANALYTICS_API_KEY": "Sanitized",
-    "TEXT_ANALYTICS_ENDPOINT": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com"
+    "TEXT_ANALYTICS_ENDPOINT": "https://ta-s-westeurope.cognitiveservices.azure.com"
   }
 }
\ No newline at end of file
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomainAsync.json b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomainAsync.json
index de304c3a708ae..be20f3619d59e 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomainAsync.json
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationBatchWithPHIDomainAsync.json
@@ -1,21 +1,14 @@
 {
   "Entries": [
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
       "RequestMethod": "POST",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
-        "Content-Length": "311",
+        "Accept": "application/json, text/json",
+        "Content-Length": "345",
         "Content-Type": "application/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "traceparent": "00-f62e67b67c75604a8b7e5c3ed4e4f0e2-f89e33ce9b23d54c-00",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "dbcf75b1d6cb24fdb41d742a5d142b0a",
         "x-ms-return-client-request-id": "true"
       },
@@ -34,7 +27,8 @@
             {
               "parameters": {
                 "domain": "phi",
-                "model-version": "latest"
+                "model-version": "latest",
+                "stringIndexType": "Utf16CodeUnit"
               }
             }
           ]
@@ -43,55 +37,49 @@
       },
       "StatusCode": 202,
       "ResponseHeaders": {
-        "apim-request-id": "7e6fcd62-47db-427b-b2ea-15e5befb55bd",
-        "Date": "Tue, 17 Nov 2020 20:12:26 GMT",
-        "operation-location": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/92f653e7-7199-4d06-814b-a184e170f6f6_637411680000000000",
+        "apim-request-id": "86164059-bc49-44bf-9a64-4c138b397f15",
+        "Date": "Fri, 15 Jan 2021 21:58:59 GMT",
+        "operation-location": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/eea48c02-88c1-49b3-8a26-d920dc385f6d_637462656000000000",
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         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "206"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "173"
       },
       "ResponseBody": []
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-          "text/json"
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-        "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
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-        "x-ms-return-client-request-id": "true"
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-        "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:14:34 GMT",
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-        "jobId": "92f653e7-7199-4d06-814b-a184e170f6f6_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:12:27Z",
-        "createdDateTime": "2020-11-17T20:12:26Z",
-        "expirationDateTime": "2020-11-18T20:12:26Z",
-        "status": "running",
-        "errors": [],
-        "tasks": {
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-            "lastUpdateDateTime": "2020-11-17T20:12:27Z"
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-          "inProgress": 1,
-          "total": 1
-        }
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-    },
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-      "RequestMethod": "GET",
-      "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
-        "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
-        "x-ms-client-request-id": "5673e6e88bfe2b0b87aae9e738078cbd",
-        "x-ms-return-client-request-id": "true"
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-      "StatusCode": 200,
-      "ResponseHeaders": {
-        "apim-request-id": "1fbba36b-6e57-41df-b2f9-54977c2bfd66",
+        "apim-request-id": "dc546ab3-8284-4b91-8ed1-a4c2918b1db1",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:14:36 GMT",
+        "Date": "Fri, 15 Jan 2021 22:01:05 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "106"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "197"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithPHIDomain",
-        "jobId": "92f653e7-7199-4d06-814b-a184e170f6f6_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:12:27Z",
-        "createdDateTime": "2020-11-17T20:12:26Z",
-        "expirationDateTime": "2020-11-18T20:12:26Z",
+        "jobId": "eea48c02-88c1-49b3-8a26-d920dc385f6d_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:59:00Z",
+        "createdDateTime": "2021-01-15T21:58:59Z",
+        "expirationDateTime": "2021-01-16T21:58:59Z",
         "status": "succeeded",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithPHIDomain",
-            "lastUpdateDateTime": "2020-11-17T20:12:27Z"
+            "lastUpdateDateTime": "2021-01-15T21:59:00Z"
           },
           "completed": 1,
           "failed": 0,
@@ -5035,7 +4270,7 @@
           "entityRecognitionPiiTasks": [
             {
               "name": "AnalyzeOperationWithPHIDomain",
-              "lastUpdateDateTime": "2020-11-17T20:12:27.3276603Z",
+              "lastUpdateDateTime": "2021-01-15T21:59:00.1309653Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -5073,6 +4308,6 @@
   "Variables": {
     "RandomSeed": "1544755028",
     "TEXT_ANALYTICS_API_KEY": "Sanitized",
-    "TEXT_ANALYTICS_ENDPOINT": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com"
+    "TEXT_ANALYTICS_ENDPOINT": "https://ta-s-westeurope.cognitiveservices.azure.com"
   }
 }
\ No newline at end of file
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasks.json b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasks.json
index 4e5843e8491c9..1a0ea9d0a0f9e 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasks.json
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasks.json
@@ -1,21 +1,14 @@
 {
   "Entries": [
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
       "RequestMethod": "POST",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
-        "Content-Length": "478",
+        "Accept": "application/json, text/json",
+        "Content-Length": "546",
         "Content-Type": "application/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "traceparent": "00-ac1679fa34090a43bd6bc15ec6a436ac-fb42f7ea732e4849-00",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "36d74cae0543ad22b4752e104a677574",
         "x-ms-return-client-request-id": "true"
       },
@@ -38,14 +31,16 @@
           "entityRecognitionTasks": [
             {
               "parameters": {
-                "model-version": "latest"
+                "model-version": "latest",
+                "stringIndexType": "Utf16CodeUnit"
               }
             }
           ],
           "entityRecognitionPiiTasks": [
             {
               "parameters": {
-                "model-version": "latest"
+                "model-version": "latest",
+                "stringIndexType": "Utf16CodeUnit"
               }
             }
           ],
@@ -61,55 +56,49 @@
       },
       "StatusCode": 202,
       "ResponseHeaders": {
-        "apim-request-id": "87225829-ab6a-4b9d-9441-a01b70800c37",
-        "Date": "Tue, 17 Nov 2020 20:10:14 GMT",
-        "operation-location": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/cc14340b-07a9-413c-b1ea-cdf12f5a41f5_637411680000000000",
+        "apim-request-id": "d0750bd8-671a-42cc-bf3b-5e29ce0c4bb3",
+        "Date": "Fri, 15 Jan 2021 21:51:30 GMT",
+        "operation-location": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000",
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         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "26"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "426"
       },
       "ResponseBody": []
     },
     {
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+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
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       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "e1873832-b534-42e4-9149-aed4ad0be7da",
+        "apim-request-id": "9fa7c565-b224-4d16-9d61-a136cd3f3ee1",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:10:15 GMT",
+        "Date": "Fri, 15 Jan 2021 21:51:30 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "12"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "128"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "cc14340b-07a9-413c-b1ea-cdf12f5a41f5_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:10:15Z",
-        "createdDateTime": "2020-11-17T20:10:15Z",
-        "expirationDateTime": "2020-11-18T20:10:15Z",
+        "jobId": "d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:51:30Z",
+        "createdDateTime": "2021-01-15T21:51:30Z",
+        "expirationDateTime": "2021-01-16T21:51:30Z",
         "status": "notStarted",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:10:15Z"
+            "lastUpdateDateTime": "2021-01-15T21:51:30Z"
           },
           "completed": 0,
           "failed": 0,
@@ -119,44 +108,38 @@
       }
     },
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+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "32033b4d84a2f3a2ac913141d710299b",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "53b18fe6-952f-48a8-947b-a700bbc69ef3",
+        "apim-request-id": "6235e0c3-28aa-4a4b-98aa-1bbafbc214ff",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:10:17 GMT",
+        "Date": "Fri, 15 Jan 2021 21:51:32 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "109"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "430"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "cc14340b-07a9-413c-b1ea-cdf12f5a41f5_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:10:16Z",
-        "createdDateTime": "2020-11-17T20:10:15Z",
-        "expirationDateTime": "2020-11-18T20:10:15Z",
+        "jobId": "d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:51:31Z",
+        "createdDateTime": "2021-01-15T21:51:30Z",
+        "expirationDateTime": "2021-01-16T21:51:30Z",
         "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:10:16Z"
+            "lastUpdateDateTime": "2021-01-15T21:51:31Z"
           },
           "completed": 0,
           "failed": 0,
@@ -166,91 +149,110 @@
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+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
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-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
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         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "55631537-96e1-43e4-b70a-95ffaacd0ac1",
+        "apim-request-id": "519ed302-5c0a-44fe-adf9-9dd80c1e1885",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:10:18 GMT",
+        "Date": "Fri, 15 Jan 2021 21:51:33 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "110"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "482"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "cc14340b-07a9-413c-b1ea-cdf12f5a41f5_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:10:16Z",
-        "createdDateTime": "2020-11-17T20:10:15Z",
-        "expirationDateTime": "2020-11-18T20:10:15Z",
+        "jobId": "d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:51:31Z",
+        "createdDateTime": "2021-01-15T21:51:30Z",
+        "expirationDateTime": "2021-01-16T21:51:30Z",
         "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:10:16Z"
+            "lastUpdateDateTime": "2021-01-15T21:51:31Z"
           },
-          "completed": 0,
+          "completed": 1,
           "failed": 0,
-          "inProgress": 3,
-          "total": 3
+          "inProgress": 2,
+          "total": 3,
+          "keyPhraseExtractionTasks": [
+            {
+              "name": "AnalyzeOperationWithMultipleTasks",
+              "lastUpdateDateTime": "2021-01-15T21:51:31.9025058Z",
+              "results": {
+                "inTerminalState": true,
+                "documents": [
+                  {
+                    "id": "1",
+                    "keyPhrases": [
+                      "Bill Gates",
+                      "Paul Allen",
+                      "Microsoft"
+                    ],
+                    "warnings": []
+                  },
+                  {
+                    "id": "2",
+                    "keyPhrases": [
+                      "gato",
+                      "perro",
+                      "veterinario"
+                    ],
+                    "warnings": []
+                  }
+                ],
+                "errors": [],
+                "modelVersion": "2020-07-01"
+              }
+            }
+          ]
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       }
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+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000?showStats=false",
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       "RequestHeaders": {
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-          "application/json",
-          "text/json"
-        ],
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-        "lastUpdateDateTime": "2020-11-17T20:10:16Z",
-        "createdDateTime": "2020-11-17T20:10:15Z",
-        "expirationDateTime": "2020-11-18T20:10:15Z",
+        "jobId": "d201455e-1656-4a19-810b-4bc65600d67e_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:51:31Z",
+        "createdDateTime": "2021-01-15T21:51:30Z",
+        "expirationDateTime": "2021-01-16T21:51:30Z",
         "status": "succeeded",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:10:16Z"
+            "lastUpdateDateTime": "2021-01-15T21:51:31Z"
           },
           "completed": 3,
           "failed": 0,
@@ -7669,7 +9354,7 @@
           "entityRecognitionTasks": [
             {
               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:10:16.4090615Z",
+              "lastUpdateDateTime": "2021-01-15T21:51:31.9025058Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -7738,7 +9423,7 @@
           "entityRecognitionPiiTasks": [
             {
               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:10:16.4090615Z",
+              "lastUpdateDateTime": "2021-01-15T21:51:31.9025058Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -7776,7 +9461,11 @@
                     "id": "2",
                     "error": {
                       "code": "InvalidArgument",
-                      "message": "Invalid language code. Supported languages: en"
+                      "message": "Invalid Language Code.",
+                      "innererror": {
+                        "code": "UnsupportedLanguageCode",
+                        "message": "Invalid language code. Supported languages: en"
+                      }
                     }
                   }
                 ],
@@ -7787,7 +9476,7 @@
           "keyPhraseExtractionTasks": [
             {
               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:10:16.4090615Z",
+              "lastUpdateDateTime": "2021-01-15T21:51:31.9025058Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -7822,6 +9511,6 @@
   "Variables": {
     "RandomSeed": "143612553",
     "TEXT_ANALYTICS_API_KEY": "Sanitized",
-    "TEXT_ANALYTICS_ENDPOINT": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com"
+    "TEXT_ANALYTICS_ENDPOINT": "https://ta-s-westeurope.cognitiveservices.azure.com"
   }
 }
\ No newline at end of file
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasksAsync.json b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasksAsync.json
index 821a24deab27f..4d0e97cfe03e9 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasksAsync.json
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/AnalyzeOperationTests/AnalyzeOperationWithMultipleTasksAsync.json
@@ -1,21 +1,14 @@
 {
   "Entries": [
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze",
       "RequestMethod": "POST",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
-        "Content-Length": "478",
+        "Accept": "application/json, text/json",
+        "Content-Length": "546",
         "Content-Type": "application/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "traceparent": "00-612fe559685ba04f933e837be7de65fc-43da7fe28c8f024f-00",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "84b09b92aaeab256574bef378bac8fd4",
         "x-ms-return-client-request-id": "true"
       },
@@ -38,14 +31,16 @@
           "entityRecognitionTasks": [
             {
               "parameters": {
-                "model-version": "latest"
+                "model-version": "latest",
+                "stringIndexType": "Utf16CodeUnit"
               }
             }
           ],
           "entityRecognitionPiiTasks": [
             {
               "parameters": {
-                "model-version": "latest"
+                "model-version": "latest",
+                "stringIndexType": "Utf16CodeUnit"
               }
             }
           ],
@@ -61,55 +56,49 @@
       },
       "StatusCode": 202,
       "ResponseHeaders": {
-        "apim-request-id": "46b8c69c-3952-46e5-938a-3a003dd93721",
-        "Date": "Tue, 17 Nov 2020 20:14:43 GMT",
-        "operation-location": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000",
+        "apim-request-id": "8683dfa7-82ad-452c-b88e-92cdf4b1d588",
+        "Date": "Fri, 15 Jan 2021 21:53:35 GMT",
+        "operation-location": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "320"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "178"
       },
       "ResponseBody": []
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "28fe54c562f9429f154e7e8cbd24fdd6",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "3e06f812-37ff-4b37-9c02-fc45227e9ec8",
+        "apim-request-id": "5bf52cf8-8c61-43fe-b213-d26015369d4d",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:14:43 GMT",
+        "Date": "Fri, 15 Jan 2021 21:53:35 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
+        "x-content-type-options": "nosniff",
         "x-envoy-upstream-service-time": "11"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:14:42Z",
-        "createdDateTime": "2020-11-17T20:14:42Z",
-        "expirationDateTime": "2020-11-18T20:14:42Z",
+        "jobId": "b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:53:35Z",
+        "createdDateTime": "2021-01-15T21:53:35Z",
+        "expirationDateTime": "2021-01-16T21:53:35Z",
         "status": "notStarted",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:14:42Z"
+            "lastUpdateDateTime": "2021-01-15T21:53:35Z"
           },
           "completed": 0,
           "failed": 0,
@@ -119,44 +108,38 @@
       }
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "d5a26188dff6bc6bb1f8fa159c08c192",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "719f0367-d8e6-4443-b7c5-bf5d98891f93",
+        "apim-request-id": "eeeca59b-9d6f-4e11-9b72-cf8cb6a957c2",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:14:44 GMT",
+        "Date": "Fri, 15 Jan 2021 21:53:36 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "81"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "111"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:14:43Z",
-        "createdDateTime": "2020-11-17T20:14:42Z",
-        "expirationDateTime": "2020-11-18T20:14:42Z",
-        "status": "notStarted",
+        "jobId": "b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:53:36Z",
+        "createdDateTime": "2021-01-15T21:53:35Z",
+        "expirationDateTime": "2021-01-16T21:53:35Z",
+        "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:14:43Z"
+            "lastUpdateDateTime": "2021-01-15T21:53:36Z"
           },
           "completed": 0,
           "failed": 0,
@@ -166,44 +149,38 @@
       }
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "d5de44db1316307dfb6e6e9b2cc9f433",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "3efac80e-926e-4c20-8823-0cf58bb1a7f9",
+        "apim-request-id": "763ebcc6-bc11-436f-b244-17756f1c1657",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:14:45 GMT",
+        "Date": "Fri, 15 Jan 2021 21:53:38 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "112"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "149"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:14:43Z",
-        "createdDateTime": "2020-11-17T20:14:42Z",
-        "expirationDateTime": "2020-11-18T20:14:42Z",
+        "jobId": "b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:53:36Z",
+        "createdDateTime": "2021-01-15T21:53:35Z",
+        "expirationDateTime": "2021-01-16T21:53:35Z",
         "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:14:43Z"
+            "lastUpdateDateTime": "2021-01-15T21:53:36Z"
           },
           "completed": 0,
           "failed": 0,
@@ -213,44 +190,38 @@
       }
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "2aae184eb909e6dee94276006789a50d",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "f8076248-b7e5-4899-bd72-bd5e6dd0f32b",
+        "apim-request-id": "c5ed8cb8-135f-4fe3-8ab6-50cdce9d77d4",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:14:46 GMT",
+        "Date": "Fri, 15 Jan 2021 21:53:39 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "146"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "150"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:14:43Z",
-        "createdDateTime": "2020-11-17T20:14:42Z",
-        "expirationDateTime": "2020-11-18T20:14:42Z",
+        "jobId": "b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:53:36Z",
+        "createdDateTime": "2021-01-15T21:53:35Z",
+        "expirationDateTime": "2021-01-16T21:53:35Z",
         "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:14:43Z"
+            "lastUpdateDateTime": "2021-01-15T21:53:36Z"
           },
           "completed": 1,
           "failed": 0,
@@ -259,7 +230,7 @@
           "keyPhraseExtractionTasks": [
             {
               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:14:43.6691381Z",
+              "lastUpdateDateTime": "2021-01-15T21:53:36.3412369Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -291,44 +262,38 @@
       }
     },
     {
-      "RequestUri": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000?showStats=false",
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/analyze/jobs/b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000?showStats=false",
       "RequestMethod": "GET",
       "RequestHeaders": {
-        "Accept": [
-          "application/json",
-          "text/json"
-        ],
+        "Accept": "application/json, text/json",
         "Ocp-Apim-Subscription-Key": "Sanitized",
-        "User-Agent": [
-          "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20201116.1",
-          "(.NET Core 4.6.29321.03; Microsoft Windows 10.0.19042 )"
-        ],
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "79b1eb8c274575c0e472da8870cf8fe8",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "aa3f5c4c-38bc-46ba-958e-bbbe83f051cf",
+        "apim-request-id": "903c8bed-d760-4f33-8d05-01d68953d1db",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:14:47 GMT",
+        "Date": "Fri, 15 Jan 2021 21:53:40 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "128"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "179"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:14:43Z",
-        "createdDateTime": "2020-11-17T20:14:42Z",
-        "expirationDateTime": "2020-11-18T20:14:42Z",
+        "jobId": "b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:53:36Z",
+        "createdDateTime": "2021-01-15T21:53:35Z",
+        "expirationDateTime": "2021-01-16T21:53:35Z",
         "status": "running",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:14:43Z"
+            "lastUpdateDateTime": "2021-01-15T21:53:36Z"
           },
           "completed": 1,
           "failed": 0,
@@ -337,7 +302,7 @@
           "keyPhraseExtractionTasks": [
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               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:14:43.6691381Z",
+              "lastUpdateDateTime": "2021-01-15T21:53:36.3412369Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -369,44 +334,38 @@
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+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
         "x-ms-client-request-id": "188018a58d32d8c5fb0ea1fdb887537b",
         "x-ms-return-client-request-id": "true"
       },
       "RequestBody": null,
       "StatusCode": 200,
       "ResponseHeaders": {
-        "apim-request-id": "afa1dde4-1e2d-4290-8d3f-013fdcba62e3",
+        "apim-request-id": "a1c8871a-2391-489d-8a74-c23f023c1b44",
         "Content-Type": "application/json; charset=utf-8",
-        "Date": "Tue, 17 Nov 2020 20:16:52 GMT",
+        "Date": "Fri, 15 Jan 2021 21:55:47 GMT",
         "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
         "Transfer-Encoding": "chunked",
-        "X-Content-Type-Options": "nosniff",
-        "x-envoy-upstream-service-time": "264"
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "225"
       },
       "ResponseBody": {
         "displayName": "AnalyzeOperationWithMultipleTasks",
-        "jobId": "27a4b2c3-47fd-41c9-8c11-eaf641d17617_637411680000000000",
-        "lastUpdateDateTime": "2020-11-17T20:14:43Z",
-        "createdDateTime": "2020-11-17T20:14:42Z",
-        "expirationDateTime": "2020-11-18T20:14:42Z",
+        "jobId": "b75ec872-40fc-45b0-b0f1-ded6b45207e6_637462656000000000",
+        "lastUpdateDateTime": "2021-01-15T21:53:36Z",
+        "createdDateTime": "2021-01-15T21:53:35Z",
+        "expirationDateTime": "2021-01-16T21:53:35Z",
         "status": "succeeded",
         "errors": [],
         "tasks": {
           "details": {
             "name": "AnalyzeOperationWithMultipleTasks",
-            "lastUpdateDateTime": "2020-11-17T20:14:43Z"
+            "lastUpdateDateTime": "2021-01-15T21:53:36Z"
           },
           "completed": 3,
           "failed": 0,
@@ -9542,7 +9959,7 @@
           "entityRecognitionTasks": [
             {
               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:14:43.6691381Z",
+              "lastUpdateDateTime": "2021-01-15T21:53:36.3412369Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -9611,7 +10028,7 @@
           "entityRecognitionPiiTasks": [
             {
               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:14:43.6691381Z",
+              "lastUpdateDateTime": "2021-01-15T21:53:36.3412369Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -9649,7 +10066,11 @@
                     "id": "2",
                     "error": {
                       "code": "InvalidArgument",
-                      "message": "Invalid language code. Supported languages: en"
+                      "message": "Invalid Language Code.",
+                      "innererror": {
+                        "code": "UnsupportedLanguageCode",
+                        "message": "Invalid language code. Supported languages: en"
+                      }
                     }
                   }
                 ],
@@ -9660,7 +10081,7 @@
           "keyPhraseExtractionTasks": [
             {
               "name": "AnalyzeOperationWithMultipleTasks",
-              "lastUpdateDateTime": "2020-11-17T20:14:43.6691381Z",
+              "lastUpdateDateTime": "2021-01-15T21:53:36.3412369Z",
               "results": {
                 "inTerminalState": true,
                 "documents": [
@@ -9695,6 +10116,6 @@
   "Variables": {
     "RandomSeed": "1060404596",
     "TEXT_ANALYTICS_API_KEY": "Sanitized",
-    "TEXT_ANALYTICS_ENDPOINT": "https://textanalytics-westeurope.ppe.cognitiveservices.azure.com"
+    "TEXT_ANALYTICS_ENDPOINT": "https://ta-s-westeurope.cognitiveservices.azure.com"
   }
 }
\ No newline at end of file
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/TextAnalyticsClientLiveTests/TextWithStringIndexType.json b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/TextAnalyticsClientLiveTests/TextWithStringIndexType.json
new file mode 100644
index 0000000000000..9e0d6f1b11b70
--- /dev/null
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/TextAnalyticsClientLiveTests/TextWithStringIndexType.json
@@ -0,0 +1,113 @@
+{
+  "Entries": [
+    {
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/entities/recognition/general?showStats=false\u0026stringIndexType=UnicodeCodePoint",
+      "RequestMethod": "POST",
+      "RequestHeaders": {
+        "Accept": "application/json, text/json",
+        "Content-Length": "87",
+        "Content-Type": "application/json",
+        "Ocp-Apim-Subscription-Key": "Sanitized",
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
+        "x-ms-client-request-id": "3ce532848ef1593a724b88483868b7d0",
+        "x-ms-return-client-request-id": "true"
+      },
+      "RequestBody": {
+        "documents": [
+          {
+            "id": "0",
+            "text": "\uD83D\uDC68 Microsoft the company.",
+            "language": "en"
+          }
+        ]
+      },
+      "StatusCode": 200,
+      "ResponseHeaders": {
+        "apim-request-id": "b8f761ab-e711-4718-9fd9-2b3eaf9a5a68",
+        "Content-Type": "application/json; charset=utf-8",
+        "csp-billing-usage": "CognitiveServices.TextAnalytics.BatchScoring=1",
+        "Date": "Fri, 15 Jan 2021 21:08:55 GMT",
+        "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
+        "Transfer-Encoding": "chunked",
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "64"
+      },
+      "ResponseBody": {
+        "documents": [
+          {
+            "id": "0",
+            "entities": [
+              {
+                "text": "Microsoft",
+                "category": "Organization",
+                "offset": 2,
+                "length": 9,
+                "confidenceScore": 0.48
+              }
+            ],
+            "warnings": []
+          }
+        ],
+        "errors": [],
+        "modelVersion": "2020-04-01"
+      }
+    },
+    {
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/entities/recognition/general?showStats=false\u0026stringIndexType=Utf16CodeUnit",
+      "RequestMethod": "POST",
+      "RequestHeaders": {
+        "Accept": "application/json, text/json",
+        "Content-Length": "87",
+        "Content-Type": "application/json",
+        "Ocp-Apim-Subscription-Key": "Sanitized",
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
+        "x-ms-client-request-id": "a760d50dc9425760caa02206e91df856",
+        "x-ms-return-client-request-id": "true"
+      },
+      "RequestBody": {
+        "documents": [
+          {
+            "id": "0",
+            "text": "\uD83D\uDC68 Microsoft the company.",
+            "language": "en"
+          }
+        ]
+      },
+      "StatusCode": 200,
+      "ResponseHeaders": {
+        "apim-request-id": "9695a1ec-c4d8-4fee-b1b7-696ca56d5af6",
+        "Content-Type": "application/json; charset=utf-8",
+        "csp-billing-usage": "CognitiveServices.TextAnalytics.BatchScoring=1",
+        "Date": "Fri, 15 Jan 2021 21:08:56 GMT",
+        "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
+        "Transfer-Encoding": "chunked",
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "75"
+      },
+      "ResponseBody": {
+        "documents": [
+          {
+            "id": "0",
+            "entities": [
+              {
+                "text": "Microsoft",
+                "category": "Organization",
+                "offset": 3,
+                "length": 9,
+                "confidenceScore": 0.48
+              }
+            ],
+            "warnings": []
+          }
+        ],
+        "errors": [],
+        "modelVersion": "2020-04-01"
+      }
+    }
+  ],
+  "Variables": {
+    "RandomSeed": "915208052",
+    "TEXT_ANALYTICS_API_KEY": "Sanitized",
+    "TEXT_ANALYTICS_ENDPOINT": "https://ta-s-westeurope.cognitiveservices.azure.com"
+  }
+}
\ No newline at end of file
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/TextAnalyticsClientLiveTests/TextWithStringIndexTypeAsync.json b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/TextAnalyticsClientLiveTests/TextWithStringIndexTypeAsync.json
new file mode 100644
index 0000000000000..a073440c3857b
--- /dev/null
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/SessionRecords/TextAnalyticsClientLiveTests/TextWithStringIndexTypeAsync.json
@@ -0,0 +1,113 @@
+{
+  "Entries": [
+    {
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/entities/recognition/general?showStats=false\u0026stringIndexType=UnicodeCodePoint",
+      "RequestMethod": "POST",
+      "RequestHeaders": {
+        "Accept": "application/json, text/json",
+        "Content-Length": "87",
+        "Content-Type": "application/json",
+        "Ocp-Apim-Subscription-Key": "Sanitized",
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
+        "x-ms-client-request-id": "075a8f19b5e3b4a52035f275295bd0f0",
+        "x-ms-return-client-request-id": "true"
+      },
+      "RequestBody": {
+        "documents": [
+          {
+            "id": "0",
+            "text": "\uD83D\uDC68 Microsoft the company.",
+            "language": "en"
+          }
+        ]
+      },
+      "StatusCode": 200,
+      "ResponseHeaders": {
+        "apim-request-id": "ebafcd7a-b076-4751-8408-0a0e63da7696",
+        "Content-Type": "application/json; charset=utf-8",
+        "csp-billing-usage": "CognitiveServices.TextAnalytics.BatchScoring=1",
+        "Date": "Fri, 15 Jan 2021 21:08:56 GMT",
+        "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
+        "Transfer-Encoding": "chunked",
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "62"
+      },
+      "ResponseBody": {
+        "documents": [
+          {
+            "id": "0",
+            "entities": [
+              {
+                "text": "Microsoft",
+                "category": "Organization",
+                "offset": 2,
+                "length": 9,
+                "confidenceScore": 0.48
+              }
+            ],
+            "warnings": []
+          }
+        ],
+        "errors": [],
+        "modelVersion": "2020-04-01"
+      }
+    },
+    {
+      "RequestUri": "https://ta-s-westeurope.cognitiveservices.azure.com/text/analytics/v3.1-preview.3/entities/recognition/general?showStats=false\u0026stringIndexType=Utf16CodeUnit",
+      "RequestMethod": "POST",
+      "RequestHeaders": {
+        "Accept": "application/json, text/json",
+        "Content-Length": "87",
+        "Content-Type": "application/json",
+        "Ocp-Apim-Subscription-Key": "Sanitized",
+        "User-Agent": "azsdk-net-AI.TextAnalytics/5.1.0-alpha.20210115.1 (.NET Framework 4.8.4250.0; Microsoft Windows 10.0.19042 )",
+        "x-ms-client-request-id": "7994e45afc1d302fc026b4788b38eca8",
+        "x-ms-return-client-request-id": "true"
+      },
+      "RequestBody": {
+        "documents": [
+          {
+            "id": "0",
+            "text": "\uD83D\uDC68 Microsoft the company.",
+            "language": "en"
+          }
+        ]
+      },
+      "StatusCode": 200,
+      "ResponseHeaders": {
+        "apim-request-id": "51908cdb-ca6f-4d11-ac5f-fc1c051da180",
+        "Content-Type": "application/json; charset=utf-8",
+        "csp-billing-usage": "CognitiveServices.TextAnalytics.BatchScoring=1",
+        "Date": "Fri, 15 Jan 2021 21:08:57 GMT",
+        "Strict-Transport-Security": "max-age=31536000; includeSubDomains; preload",
+        "Transfer-Encoding": "chunked",
+        "x-content-type-options": "nosniff",
+        "x-envoy-upstream-service-time": "87"
+      },
+      "ResponseBody": {
+        "documents": [
+          {
+            "id": "0",
+            "entities": [
+              {
+                "text": "Microsoft",
+                "category": "Organization",
+                "offset": 3,
+                "length": 9,
+                "confidenceScore": 0.48
+              }
+            ],
+            "warnings": []
+          }
+        ],
+        "errors": [],
+        "modelVersion": "2020-04-01"
+      }
+    }
+  ],
+  "Variables": {
+    "RandomSeed": "93312888",
+    "TEXT_ANALYTICS_API_KEY": "Sanitized",
+    "TEXT_ANALYTICS_ENDPOINT": "https://ta-s-westeurope.cognitiveservices.azure.com"
+  }
+}
\ No newline at end of file
diff --git a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/TextAnalyticsClientLiveTests.cs b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/TextAnalyticsClientLiveTests.cs
index 463f215fd1b3b..89f387d196097 100644
--- a/sdk/textanalytics/Azure.AI.TextAnalytics/tests/TextAnalyticsClientLiveTests.cs
+++ b/sdk/textanalytics/Azure.AI.TextAnalytics/tests/TextAnalyticsClientLiveTests.cs
@@ -25,6 +25,27 @@ public async Task TextWithEmoji()
             Assert.AreEqual(3, entities.FirstOrDefault().Offset);
         }
 
+        [Test]
+        public async Task TextWithStringIndexType()
+        {
+            TextAnalyticsClient client = GetClient();
+            string document = "👨 Microsoft the company.";
+
+            RecognizeEntitiesResultCollection responseWithUnicodeCodePoint = await client.RecognizeEntitiesBatchAsync(new List<string>() { document }, "en", new TextAnalyticsRequestOptions() { StringIndexType = StringIndexType.UnicodeCodePoint });
+            RecognizeEntitiesResultCollection responseWithUtf16CodeUnit = await client.RecognizeEntitiesBatchAsync(new List<string>() { document }, "en");
+
+            var entitiesWithUnicodeCodePoint = responseWithUnicodeCodePoint.FirstOrDefault().Entities;
+            var entitiesWithUtf16CodeUnit = responseWithUtf16CodeUnit.FirstOrDefault().Entities;
+
+            Assert.AreEqual(1, entitiesWithUnicodeCodePoint.Count);
+            Assert.AreEqual("Microsoft", entitiesWithUnicodeCodePoint.FirstOrDefault().Text);
+            Assert.AreEqual(2, entitiesWithUnicodeCodePoint.FirstOrDefault().Offset);
+
+            Assert.AreEqual(1, entitiesWithUtf16CodeUnit.Count);
+            Assert.AreEqual("Microsoft", entitiesWithUtf16CodeUnit.FirstOrDefault().Text);
+            Assert.AreEqual(3, entitiesWithUtf16CodeUnit.FirstOrDefault().Offset);
+        }
+
         [Test]
         public async Task TextWithDiacriticsNFC()
         {