Remove deprecation annotations for TransportSingleItemBulkWriteAction and children

In practice, these adapter classes are unlikely to be removed, unless we
drop support (at the API level) for the single-item operations. Since
the single item operations are likely to stick around, we have no plan
to remove these adapter classes.

Signed-off-by: Michael Froh <[email protected]>

Author: msfroh

server/src/main/java/org/opensearch/action/bulk/TransportSingleItemBulkWriteAction.java

@@ -50,7 +50,6 @@
  *
  * @opensearch.internal
  */
-@Deprecated
 public abstract class TransportSingleItemBulkWriteAction<
     Request extends ReplicatedWriteRequest<Request>,
     Response extends ReplicationResponse & WriteResponse> extends HandledTransportAction<Request, Response> {

server/src/main/java/org/opensearch/action/delete/TransportDeleteAction.java

@@ -39,13 +39,11 @@
 import org.opensearch.transport.TransportService;
 
 /**
- * Performs the delete operation.
+ * Performs the delete operation by delegating to {@link TransportBulkAction} with a single delete operation.
  * <p>
- * Deprecated use TransportBulkAction with a single item instead
  *
  * @opensearch.internal
  */
-@Deprecated
 public class TransportDeleteAction extends TransportSingleItemBulkWriteAction<DeleteRequest, DeleteResponse> {
 
     @Inject

server/src/main/java/org/opensearch/action/index/TransportIndexAction.java

@@ -48,11 +48,10 @@
  * <li><b>allowIdGeneration</b>: If the id is set not, should it be generated. Defaults to {@code true}.
  * </ul>
  *
- * Deprecated use TransportBulkAction with a single item instead
+ * Delegates to {@link TransportBulkAction} to process a single index operation.
  *
  * @opensearch.internal
  */
-@Deprecated
 public class TransportIndexAction extends TransportSingleItemBulkWriteAction<IndexRequest, IndexResponse> {
 
     @Inject

server/src/main/java/org/opensearch/action/update/TransportUpdateAction.java

@@ -46,13 +46,10 @@
 import org.opensearch.transport.TransportService;
 
 /**
- * Performs the update operation.
- * <p>
- * Deprecated use TransportBulkAction with a single item instead
+ * Performs the update operation by delegating to {@link TransportBulkAction} with a single update operation.
  *
  * @opensearch.internal
  */
-@Deprecated
 public class TransportUpdateAction extends HandledTransportAction<UpdateRequest, UpdateResponse> {
 
     private final TransportBulkAction bulkAction;