Elasticsearch 6.0.0 GA released

Elasticsearch 6.0.0 GA, based on Lucene 7.0.1, marks a significant upgrade from version 5.0.0, featuring 2,236 pull requests by 333 contributors. The new release offers enhancements such as no-downtime rolling upgrades from Elasticsearch 5.x, improved search scalability with Cross Cluster Search, and the introduction of sequence IDs for more efficient shard recovery. Major improvements include reduced disk space usage for sparsely populated fields and faster query times through index sorting. Additionally, Elasticsearch 6.0 requires indices to have only a single mapping type, moving towards the removal of mapping types altogether. Security updates in X-Pack include mandatory TLS/SSL between nodes and the elimination of the default password "changeme," replaced by a tool to generate strong passwords. Users are encouraged to explore Elasticsearch 6.0.0 and provide feedback through various channels.