Relase Notes Latest RC release of elasticsearch is 0.90.0.RC1. Upgrade Notes: Upgrading from 0.19 requires a full cluster restart. Breaking Changes: Shared Gateway has been deprecated (2458) Snappy compression has been deprecated (2459) Plugins Installer: Allow to download plugins from download.elasticsearch.org (#2507) Enhancements: Id Cache: Allow to configure if ids should be reused (memory wise) or not, default to false (#2605) Bug fixes: Cached script filter is not used in consecutive searches (#2651) Warmers do not load field data cache for sorting on new segments (#2649) possibly incorrect use of Lucene OneMerge.totalBytesSize (#2643) Bulk execution while a shard is replication might send erroneous version conflict failures for certain items (#2642) Index with no replicas might loose on going documents while relocating a shard (#2641) Filter cache stats may report incorrect values when index is recreated (#2609) NullPointerException (#2608)