Today, we are excited to announce the release of Elasticsearch 2.0.0-beta1, based on Lucene 5.2.1. This release contains over 2,500 pull requests from 469 committers. 850 of the pull requests are completely new to 2.0.
IMPORTANT: This is a beta release and is intended for testing purposes only. There is no guarantee that Elasticsearch 2.0.0-beta1 will be compatible with Elasticsearch 2.0.0 GA.
DO NOT DEPLOY IN PRODUCTION
You can read the blog post about Elasticsearch 2.0.0-beta1 here.