Update CHANGELOG.md

kiranprakash154 · kiranprakash154 · commit 30a95a502b9a · 2024-06-17T11:51:19.000-07:00
Signed-off-by: Kiran Prakash &lt;awskiran@amazon.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -24,6 +24,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Removed
 
 ### Fixed
+- Used ConcurrentHashMap explicitly in IndicesRequestCache ([#14409](https://github.com/opensearch-project/OpenSearch/pull/14409))
 
 ### Security
 
