Added entry in changelog

Signed-off-by: Owais Kazi <owaiskazi19@gmail.com>

CHANGELOG.md

@@ -97,7 +97,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - 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 descending order search optimization through reverse segment read. ([#7967](https://github.com/opensearch-project/OpenSearch/pull/7967))
-
+- 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))
@@ -123,4 +123,4 @@ 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/2.8...2.x
+[Unreleased 2.x]: https://github.com/opensearch-project/OpenSearch/compare/2.8...2.x