Add change log

Signed-off-by: Junwei Dai <junweid@amazon.com>

CHANGELOG.md

@@ -22,6 +22,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Add new configuration setting `synonym_analyzer`, to the `synonym` and `synonym_graph` filters, enabling the specification of a custom analyzer for reading the synonym file ([#16488](https://github.com/opensearch-project/OpenSearch/pull/16488)).
 - Add stats for remote publication failure and move download failure stats to remote methods([#16682](https://github.com/opensearch-project/OpenSearch/pull/16682/))
 - Added a precaution to handle extreme date values during sorting to prevent `arithmetic_exception: long overflow` ([#16812](https://github.com/opensearch-project/OpenSearch/pull/16812)).
+- Add `verbose_pipeline` parameter to output each processor's execution details ([#14745](https://github.com/opensearch-project/OpenSearch/pull/14745)).
 
 ### Dependencies
 - Bump `com.google.cloud:google-cloud-core-http` from 2.23.0 to 2.47.0 ([#16504](https://github.com/opensearch-project/OpenSearch/pull/16504))