Added entry in changelog

Signed-off-by: Owais Kazi <[email protected]>

Author: owaiskazi19

Diff for: CHANGELOG.md

@@ -92,6 +92,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Added
 - Add TokenManager Interface ([#7452](https://github.com/opensearch-project/OpenSearch/pull/7452))
 - Add Remote store as a segment replication source ([#7653](https://github.com/opensearch-project/OpenSearch/pull/7653))
+- Add API to initialize extensions ([#8029]()https://github.com/opensearch-project/OpenSearch/pull/8029)
 
 ### Dependencies
 - Bump `jackson` from 2.15.1 to 2.15.2 ([#7897](https://github.com/opensearch-project/OpenSearch/pull/7897))