Updated CHANGELOG.

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

CHANGELOG.md

@@ -122,6 +122,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fix broken backward compatibility from 2.7 for IndexSorted field indices ([#10045](https://github.com/opensearch-project/OpenSearch/pull/10045))
 - Fix concurrent search NPE when track_total_hits, terminate_after and size=0 are used ([#10082](https://github.com/opensearch-project/OpenSearch/pull/10082))
 - Fix remove ingest processor handing ignore_missing parameter not correctly ([10089](https://github.com/opensearch-project/OpenSearch/pull/10089))
+- Fix registration and initialization of multiple extensions ([10256](https://github.com/opensearch-project/OpenSearch/pull/10256))
 
 ### Security