Elasticsearch 5.2.2, released on February 28, 2017, is the latest stable release in the 5.x series and is based on Lucene 6.4.1, available for deployment on Elastic Cloud. This release includes minor bug fixes, with notable improvements such as a fix for the request circuit breaker issue that prevented further requests after a client prematurely closed a connection, and a regex bug fix in the cgroup functionality that affected nodes with multiple hierarchies. Additionally, the release addresses unauthorized request rejections caused by shard lock delays and the removal of an undocumented syntax for include/exclude parameters in terms aggregation that affected Kibana. Users are encouraged to upgrade to this version, provide feedback on social media or forums, and report any issues on GitHub.