[Backport 1.3] Release notes for 1.3.15 (#12511)

* Add release notes for 1.3.15

Signed-off-by: Kunal Kotwani <[email protected]>

* Clean up changelog

Signed-off-by: Kunal Kotwani <[email protected]>

---------

Signed-off-by: Kunal Kotwani <[email protected]>

Author: kotwanikunal

CHANGELOG.md

@@ -6,15 +6,11 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Added
 ### Dependencies
-- Bump `netty` from 4.1.100.Final to 4.1.104.Final ([#11294](https://github.com/opensearch-project/OpenSearch/pull/11294), [#11775](https://github.com/opensearch-project/OpenSearch/pull/11775)), [#12034](https://github.com/opensearch-project/OpenSearch/pull/12034))
-- Bump `netty` from 4.1.106.Final to 4.1.107.Final ([#12372](https://github.com/opensearch-project/OpenSearch/pull/12372))
-- Bump `org.apache.kerby:kerb-admin` from 1.0.1 to 2.0.3 ([#12194](https://github.com/opensearch-project/OpenSearch/pull/12194))
-
 ### Changed
 ### Deprecated
 ### Removed
 ### Fixed
 
 ### Security
 
-[Unreleased 1.3.x]: https://github.com/opensearch-project/OpenSearch/compare/1.3.12...HEAD
+[Unreleased 1.3.x]: https://github.com/opensearch-project/OpenSearch/compare/1.3.15...HEAD

release-notes/opensearch.release-notes-1.3.15.md

@@ -0,0 +1,6 @@
+## 2024-03-01 Version 1.3.15 Release Notes
+
+### Upgrades
+- Bump `netty` from 4.1.100.Final to 4.1.104.Final ([#11294](https://github.com/opensearch-project/OpenSearch/pull/11294), [#11775](https://github.com/opensearch-project/OpenSearch/pull/11775)), [#12034](https://github.com/opensearch-project/OpenSearch/pull/12034))
+- Bump `netty` from 4.1.106.Final to 4.1.107.Final ([#12372](https://github.com/opensearch-project/OpenSearch/pull/12372))
+- Bump `org.apache.kerby:kerb-admin` from 1.0.1 to 2.0.3 ([#12194](https://github.com/opensearch-project/OpenSearch/pull/12194))