Elasticsearch 2.0 released

Released Elasticsearch 2.0. A major milestone and achievement of the whole team, and wonderful contributions from the community. New type of aggregations called pipeline aggs, simplified query DSL by merging query and filter concepts, better compression options, hardened security by enabling security manager, hardening of FS behavior (fsync, more checksums, atomic renames), performance, consistent mapping behavior, and many more. Also, it bundles Lucene 5 release, which includes numerous improvements.