[Release 2.19.3] Add release notes (#18811) (#18813)

* Add 2.19.3 release notes



* Add 2.19.3 release notes



* Add 2.19.3 release notes



---------


(cherry picked from commit 4df464c)

Signed-off-by: Prudhvi Godithi <[email protected]>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

release-notes/opensearch.release-notes-2.19.3.md

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+## 2025-07-22 Version 2.19.3 Release Notes
+
+## [2.19.3]
+### Added
+- Reject close index requests, while remote store migration is in progress.([#18327](https://github.com/opensearch-project/OpenSearch/pull/18327))
+
+### Dependencies
+- Bump `netty` from 4.1.118.Final to 4.1.121.Final ([#18192](https://github.com/opensearch-project/OpenSearch/pull/18192))
+- Bump Apache Lucene to 9.12.2 ([#18574](https://github.com/opensearch-project/OpenSearch/pull/18574))
+- Bump `commons-beanutils:commons-beanutils` from 1.9.4 to 1.11.0 ([#18401](https://github.com/opensearch-project/OpenSearch/issues/18401))
+- Bump `org.apache.poi` version from 5.2.5 to 5.4.1 in /plugins/ingest-attachment ([#17887](https://github.com/opensearch-project/OpenSearch/pull/17887))
+
+### Fixed
+- Use Bad Request status for InputCoercionException ([#18161](https://github.com/opensearch-project/OpenSearch/pull/18161))
+- Avoid NPE if on SnapshotInfo if 'shallow' boolean not present ([#18187](https://github.com/opensearch-project/OpenSearch/issues/18187))
+- Null check field names in QueryStringQueryBuilder ([#18194](https://github.com/opensearch-project/OpenSearch/pull/18194))
+- Fix illegal argument exception when creating a PIT ([#16781](https://github.com/opensearch-project/OpenSearch/pull/16781))
+- Fix the bug of Access denied error when rolling log files ([#18597](https://github.com/opensearch-project/OpenSearch/pull/18597))
+
+### Changed
+- Change single shard assignment log message from warn to debug ([#18186](https://github.com/opensearch-project/OpenSearch/pull/18186))