Elasticsearch 5.4.2 released

Elasticsearch 5.4.2, a bug fix release based on Lucene 6.5.1, is now available and deployable on Elastic Cloud. Key improvements include resolving issues where installations using systemd with X-Pack could hang during shutdown, preventing out-of-memory errors in aggregations by better managing memory allocation, and optimizing memory usage in terms aggregations that sort on sub-aggregations. Additionally, geo-point fields from indices created in version 2.x now function correctly with the field stats API. Users are encouraged to download the update, provide feedback via Twitter or forums, and report any issues on GitHub.