Add release notes for v2.19 (#1365)

* Add release notes for v2.19

Signed-off-by: Vaibhav Agarwal <vaibhoag@amazon.com>

* Added release notes for v2.19.0

Signed-off-by: Vaibhav Agarwal <vaibhoag@amazon.com>

* Added Release Notes for v2.19.0

Signed-off-by: Vaibhav Agarwal <vaibhoag@amazon.com>

---------

Signed-off-by: Vaibhav Agarwal <vaibhoag@amazon.com>

Author: vaibhoag

release-notes/opensearch-index-management.release-notes-2.19.0.0.md

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+## Version 2.19.0.0 2025-02-05
+
+Compatible with OpenSearch 2.19.0
+
+### Enhancements
+* Use adminClient when searching system index in integ tests ([#1286](https://github.com/opensearch-project/index-management/pull/1286))
+
+
+### Bug fixes
+* Fix 2.x build due to bug fix on update settings requests on read only indices in core ([#1315](https://github.com/opensearch-project/index-management/pull/1315))
+
+
+### Maintenance
+* Update maintainers and codeowners of the repo ([#1316](https://github.com/opensearch-project/index-management/pull/1316))
+* Revert "Update maintainers and codeowners of the repo" ([#1320](https://github.com/opensearch-project/index-management/pull/1320))
+* dependabot: bump commons-codec:commons-codec from 1.13 to 1.17.2 ([#1335](https://github.com/opensearch-project/index-management/pull/1335))
+* Added new maintainers to ISM ([#1339](https://github.com/opensearch-project/index-management/pull/1339))
+* dependabot: bump com.puppycrawl.tools:checkstyle from 8.29 to 8.45.1  ([#1337](https://github.com/opensearch-project/index-management/pull/1337))
+* bump ktlint 1.1.0 to 1.5.0 ([#1338](https://github.com/opensearch-project/index-management/pull/1338))
+
+
+