Add changelog

Signed-off-by: Vinay Krishna Pudyodu <[email protected]>

Author: vinaykpud

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Security Manager Replacement] Create initial Java Agent to intercept Socket::connect calls ([#17724](https://github.com/opensearch-project/OpenSearch/pull/17724))
 - Add ingestion management APIs for pause, resume and get ingestion state ([#17631](https://github.com/opensearch-project/OpenSearch/pull/17631))
 - [Security Manager Replacement] Enhance Java Agent to intercept System::exit ([#17746](https://github.com/opensearch-project/OpenSearch/pull/17746))
+- Support AutoExpand for SearchReplica ([#17741](https://github.com/opensearch-project/OpenSearch/pull/17741))
 
 ### Changed
 - Migrate BC libs to their FIPS counterparts ([#14912](https://github.com/opensearch-project/OpenSearch/pull/14912))