Add the match_only_text rewrite fix to release notes (#14286)

Signed-off-by: Rishabh Maurya <rishabhmaurya05@gmail.com>

Author: rishabhmaurya

release-notes/opensearch.release-notes-2.15.0.md

@@ -71,4 +71,5 @@
 - Fix ReplicaShardBatchAllocator to batch shards without duplicates ([#13710](https://github.com/opensearch-project/OpenSearch/pull/13710))
 - 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))
-- Fix Concurrent Modification Exception in Indices Request Cache([#14032](https://github.com/opensearch-project/OpenSearch/pull/14221))
+- Fix Concurrent Modification Exception in Indices Request Cache([#14032](https://github.com/opensearch-project/OpenSearch/pull/14221))
+- Fix the rewrite method for MatchOnlyText field query ([#14248](https://github.com/opensearch-project/OpenSearch/pull/14248))