Add release notes for 2.9.0 (#1063)

Add release notes for 2.9 release
Signed-off-by: monusingh-1 <[email protected]>

release-notes/opensearch-cross-cluster-replication.release-notes-2.9.0.0.md

@@ -0,0 +1,12 @@
+## Version 2.9.0.0 Release Notes
+
+Compatible with OpenSearch 2.9.0
+
+
+### Bug Fixes
+* Handle bug in Shard replication task assignment ([#881](https://github.com/opensearch-project/cross-cluster-replication/pull/881))
+* Update Leader checkpoint when shard replication task is reinitialized ([#904](https://github.com/opensearch-project/cross-cluster-replication/pull/904))
+* Correctly handle retention lease renewal (if the lease already exists) during bootstrap ([#904](https://github.com/opensearch-project/cross-cluster-replication/pull/904))
+* Clear persistent tasks from cluster state after STOP API is triggered ([#905](https://github.com/opensearch-project/cross-cluster-replication/pull/905))
+* Handle OpenSearchRejectExecuteException Exception during replay ([#1004](https://github.com/opensearch-project/cross-cluster-replication/pull/1004))
+* Fix Resume replication flow in dedicated master node configuration ([#1030](https://github.com/opensearch-project/cross-cluster-replication/pull/1030))