Added changelog

Signed-off-by: Sagar Upadhyaya <[email protected]>

Author: sgup432

CHANGELOG.md

@@ -74,6 +74,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fix NPE on restore searchable snapshot ([#13911](https://github.com/opensearch-project/OpenSearch/pull/13911))
 - Fix double invocation of postCollection when MultiBucketCollector is present ([#14015](https://github.com/opensearch-project/OpenSearch/pull/14015))
 - Java high-level REST client bulk() is not respecting the bulkRequest.requireAlias(true) method call ([#14146](https://github.com/opensearch-project/OpenSearch/pull/14146))
+- Fix ShardNotFoundException during request cache clean up ([#14219](https://github.com/opensearch-project/OpenSearch/pull/14219))
 
 ### Security