New features:

• Index Settings: Add index.recovery.initial_shards controlling the number of shards to exists when using local gateway (#1163)
• Query DSL:
  • custom_filters_score (#1140)
  • Allow to associate a custom cache key with a filter (#1142)

Enhancements:

• Fail shard (recovery) allocation on a node when the index does not exists (#1148)
• Improve peer recovery of index files to reduce chances of corruption (#1158)
• Local Gateway: Allow to set gateway.local.initial_shards to quorum-1 (#1160)

Bug fixes:

• Reusing query parser in WrapperQueryParser produces invalid queries (#1143)
• File#mkdirs gets stuck, might be concurrency issue (#1147)
• Search / Broadcast concurrency bug can result in response corruption / errors (#1152)
• Bulk API: _version on delete actions is not honored (#1156)
• Get API:
  • Will always prefer first local execution, regardless of the preference (#1153)
  • a get for a document that does not exists can cause open file handles leak (#1167)
• Java API: BoostingQueryBuilder does not build the query correctly (#1141)
• Mapping: default mapping type with root level date_formats can cause recursive addition of them to the mapping (#1168)
• Search API: REST endpoint should use default operation_threading of thread_per_shard (#1154)
• Unicast Discovery: Clusters under different cluster names can cause failed discovery (#1159)
• Update Settings: Changing the number of replicas does cause allocation / deallocation of shards (#1162)