Latest RC release of elasticsearch is 0.90.0.RC1.
- Upgrading from 0.19 requires a full cluster restart.
- Shared Gateway has been deprecated (2458)
- Snappy compression has been deprecated (2459)
- Plugins Installer: Allow to download plugins from download.elasticsearch.org (#2507)
- Id Cache: Allow to configure if ids should be reused (memory wise) or not, default to false (#2605)
- 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)