What's Changed
* Update version.txt to 1.4.0 after 1.3.0 release by IanHoang in https://github.com/opensearch-project/opensearch-benchmark/pull/469
* Add Maintainers Guide and Release Guide to OSB by IanHoang in https://github.com/opensearch-project/opensearch-benchmark/pull/467
* Fix client processing time calculation in ForceMerge Runner by saimedhi in https://github.com/opensearch-project/opensearch-benchmark/pull/470
* Revise RELEASE_GUIDE.md for better practices and clarity on patch releases by IanHoang in https://github.com/opensearch-project/opensearch-benchmark/pull/479
* Add Rishabh as maintainer after vote by IanHoang in https://github.com/opensearch-project/opensearch-benchmark/pull/482
* Bumping Jinja2 to version 3.1.1 for CVE by beaioun in https://github.com/opensearch-project/opensearch-benchmark/pull/487
* Update opensearch-py to 2.5.0 by VijayanB in https://github.com/opensearch-project/opensearch-benchmark/pull/488
**Full Changelog**: https://github.com/opensearch-project/opensearch-benchmark/compare/1.3.1...1.4.0