Moving concurrent-search out of sandbox plugin to core behind feature…

… flag (opensearch-project#7203)

Signed-off-by: Sorabh Hamirwasia <sohami.apache@gmail.com>
(cherry picked from commit fde8fa4)

CHANGELOG.md

@@ -8,6 +8,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Extensions] Moving Extensions APIs to support cross versions via protobuf. ([#6960](https://github.com/opensearch-project/OpenSearch/pull/6960))
 - Add connectToNodeAsExtension in TransportService ([#6866](https://github.com/opensearch-project/OpenSearch/pull/6866))
 - [Extensions] Add IdentityPlugin into core to support Extension identities ([#7393](https://github.com/opensearch-project/OpenSearch/pull/7393))
+- Add descending order search optimization through reverse segment read. ([#7244](https://github.com/opensearch-project/OpenSearch/pull/7244))
+- [Extensions] Moving RestActions APIs to protobuf serialization. ([#7302](https://github.com/opensearch-project/OpenSearch/pull/7302))
 
 ### Dependencies
 - Bump `com.netflix.nebula:gradle-info-plugin` from 12.0.0 to 12.1.0
@@ -21,6 +23,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Bump `commons-io:commons-io` from 2.7 to 2.11.0
 
 ### Changed
+- Enable `./gradlew build` on MacOS by disabling bcw tests ([#7303](https://github.com/opensearch-project/OpenSearch/pull/7303))
+- Moved concurrent-search from sandbox plugin to server module behind feature flag ([#7203](https://github.com/opensearch-project/OpenSearch/pull/7203))
 
 ### Deprecated
 
@@ -31,4 +35,5 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ### Security
 
-
+[Unreleased 3.0]: https://github.com/opensearch-project/OpenSearch/compare/2.x...HEAD
+[Unreleased 2.x]: https://github.com/opensearch-project/OpenSearch/compare/2.5...2.x