[TA] Update changelog (#18580)

Fixes: #18563

sdk/textanalytics/Azure.AI.TextAnalytics/CHANGELOG.md

@@ -1,22 +1,41 @@
 # Release History
 
-## 5.1.0-beta.4 (Unreleased)
+## 5.1.0-beta.4 (2021-02-10)
 ### New features
 - Added property `Length` to `CategorizedEntity`, `SentenceSentiment`, `LinkedEntityMatch`, `AspectSentiment`, `OpinionSentiment`, and `PiiEntity`.
-- `StringIndexType` has been added to all endpoints as a new option to control how the `Offset` and `Length` are calculated by the service.
+- `StringIndexType` has been added to all endpoints that expose the new properties `Offset` and `Length` to determine the endoding the service should use. It is added into the `TextAnalyticsRequestOptions` class and default for this SDK is `UTF-16`.
+- `AnalyzeHealthcareEntitiesOperation` now exposes the properties `CreatedOn`, `ExpiresOn`, `LastModified`, and `Status`.
+- `AnalyzeBatchActionsOperation ` now exposes the properties `CreatedOn`, `ExpiresOn`, `LastModified`, `Status`, `ActionsFailed`, `ActionsInProgress`,  `ActionsSucceeded`,  `DisplayName`, and `TotalActions`.
 
 ### Breaking changes
+- Renamed `JobStatus` to `TextAnalyticsOperationStatus`.
+
+#### Analyze Healthcare Entities
+- Pagination support was added for all `StartAnalyzeHealthcareEntities` methods.
+- Moved `Cancel` and `CancelAsync` for Healthcare from `TextAnalyticsClient` to `AnalyzeHealthcareEntitiesOperation`.
+- The healthcare entities returned by `StartAnalyzeHealthcareEntities` are now organized as a directed graph where the edges represent a certain type of healthcare relationship between the source and target entities. Edges are stored in the `RelatedEntities` property.
+- Renamed `StartHealthcareBatch` and `StartHealthcareBatchAsync` to `StartAnalyzeHealthcareEntities` and `StartAnalyzeHealthcareEntitiesAsync` respectively.
 - Renamed `RecognizeHealthcareEntitiesResultCollection` to `AnalyzeHealthcareEntitiesResultCollection`.
 - Renamed `DocumentHealthcareResult` to `AnalyzeHealthcareEntitiesResult`.
-- Removed `StartHealthcare` and `StartHealthcareAsync` methods.
-- Renamed `StartHealthcareBatch` and `StartHealthcareBatchAsync` to `StartAnalyzeHealthcareEntities` and `StartAnalyzeHealthcareEntitiesAsync` respectively.
 - Renamed `HealthcareOperation` to `AnalyzeHealthcareEntitiesOperation`.
-- Renamed `HealthcareOptions` to `AnalyzeHealthcareEntitiesOptions`.
-- Moved `Cancel` and `CancelAsync` for Healthcare from `TextAnalyticsClient` to `AnalyzeHealthcareEntitiesOperation`.
-- Renamed `JobStatus` to `TextAnalyticsOperationStatus`.
+- Renamed `HealthcareOptions` to `AnalyzeHealthcareEntitiesOptions`, and removed types `Skip` and `Top` from it. Pagination is now done automatically by the SDK.
 - Renamed `HealthcareEntityLink` to `EntityDataSource` with `DataSource` to `EntityDataSource` and `Id` to `Name`.
-- Removed `HealthcareRelation` and added `HealthcareRelationType`.
-
+- Renamed `HealthcareRelation` to `HealthcareRelationType`.
+- Removed method `GetHealthcareEntities` as pagination is now done with the main `StartAnalyzeHealthcareEntities` methods.
+- Removed `HealthcareTaskResult`.
+- Removed `StartHealthcare` and `StartHealthcareAsync` methods.
+- Removed `IsNegated` property from `HealthcareEntity`.
+
+#### Analyze batch actions
+- The word `action` is now used consistently in our names and documentation instead of `task`.
+- Pagination support was added for all `StartAnalyzeBatchActions` methods.
+- Renamed methods `StartAnalyzeOperationBatch` and `StartAnalyzeOperationBatchAsync` to `StartAnalyzeBatchActions` and `StartAnalyzeBatchActionsAsync` respectively.
+- Type `TextAnalyticsActions` added to `StartAnalyzeBatchActions` methods to specify the actions to execute in the batch of documents instead of in `AnalyzeOperationOptions`.
+- The way to configure the options for each action is now exposed in the respective `ExtractKeyPhrasesOptions`, `RecognizeEntitiesOptions`, or `RecognizePiiEntitiesOptions` object.
+- Results for the `StartAnalyzeBatchActions` method are now returned in a `AnalyzeHealthcareEntitiesResultCollection` object that contains information per type of action.
+- Renamed `AnalyzeOperation` to `AnalyzeBatchActionsOperation`.
+- Reuse `PiiEntityDomainType` instead of `PiiTaskParametersDomain`.
+- Removed `AnalyzeTasks`, `EntitiesTask`, `EntitiesTaskParameters`, `EntityRecognitionTasksItem`, `JobManifestTasks`, `KeyPhraseExtractionTasksItem`, `KeyPhrasesTask`, `KeyPhrasesTaskParameters`, `PiiTask`, `PiiTaskParameters`.
 
 ## 5.1.0-beta.3 (2020-11-19)
 ### New Features