[Text Analytics] Expose StringIndextype for all endpoints (#17968)

Expose stringindextype to all endpoints

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
     {

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;
     }
 }

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