Modify changelog

Signed-off-by: Binlong Gao <gbinlong@amazon.com>

Author: gaobinlong

CHANGELOG.md

@@ -18,7 +18,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Removed
 
 ### Fixed
-- Fix ingest pipeline cannot be executed when retry the failed index requests for update_by_query API and reindex API
+- Fix ingest pipeline cannot be executed when retry the failed index requests for update_by_query API and reindex API ([#18003](https://github.com/opensearch-project/OpenSearch/pull/18003))
 
 ### Security