add changelog entry

Signed-off-by: bansvaru <bansvaru@amazon.com>

CHANGELOG.md

@@ -155,6 +155,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Improve performance of encoding composite keys in multi-term aggregations ([#9412](https://github.com/opensearch-project/OpenSearch/pull/9412))
 - Fix sort related ITs for concurrent search ([#9177](https://github.com/opensearch-project/OpenSearch/pull/9466)
 - Removing the vec file extension from INDEX_STORE_HYBRID_NIO_EXTENSIONS, to ensure the no performance degradation for vector search via Lucene Engine.([#9528](https://github.com/opensearch-project/OpenSearch/pull/9528)))
+- [Remote Store] Implicitly use replication type SEGMENT for remote store clusters ([#9264](https://github.com/opensearch-project/OpenSearch/pull/9264))
 
 ### Deprecated