Today we are pleased to announce the release of Elasticsearch 2.3.0 based on Lucene 5.5.0, along with the bug fix release of Elasticsearch 2.2.2 based on Lucene 5.4.1. Both of these new releases are already available on Elastic Cloud, our Elasticsearch-as-a-service platform.
Elasticsearch 2.3.0 delivers three of the most-asked-for features in the history of Elasticsearch: the reindex API, the update-by-query API, and the task management API, along with deprecation logging to help you to prepare for Elasticsearch 5.0.
More details in the blogpost: https://www.elastic.co/blog/elasticsearch-2-3-0-and-2-2-2-released