Upgrade Notes:

• Upgrading from 0.18 requires issuing a full flush of all the indices in the cluster (curl host:9200/_flush) before shutting down the cluster, with no indexing operations happening after the flush.
• The local gateway state structure has changed from 0.18, a backup of the state files is created when upgrading, they can then be used to downgrade back to 0.18. Don’t downgrade without using them.

New features:

• Support wildcard and +/- notation for multi index APIs (#2074)
• Auto import dangling indices (#2067)

Enhancements:

• getSourceAsString() for doc inserted as SMILE fails, auto convert to JSON (#2064)

Bug fixes:

• (full) recovery memory based indices with local gateway, don’t fail them (#2077)
• Exists API can send response body (#2072)
• dangling index handling might still remove the state files for the dangling index (#2065)
• Setting index to no ends up using by default the “keyword” analyzer on it, which means one can’t highlight on it when searching on _all (#2062)
• ElasticSearchIllegalStateException: stream marked as compressed, but no compressor found on transport layer (#2076)
• Store Compression: integer overflow causes failed reads (index is safe) (#2071)