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, 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:

• Allow to customize quote analyzer to be used when quoting text in a query_string (#1931)
• Query DSL: query_string syntax to support wildcard fieldnames in the query text (#1936)

Enhancements:

• Support Java Date when serializing update parameters (#1902)
• Upgrade to jackson 1.9.7 (#1908)
• Upgrade to Netty 3.4.2 (#1909)
• Upgrade to netty 3.4.3.Final (#1914)
• Upgrade to guava 12.0 (#1920)
• Binary field is stored by default, allow to disable it (#1919)
• Upgrade to Netty 3.4.5 (#1958)
• Debian: Update deps to be on openjdk-7-jre-headless first, then 6 (#1929)
• Get API:
  • When _source is disabled, the source is still used if fetched from the transaction log (#1927)
  • Allow to provide a parent value which automatically set the routing value (#1961)
• Java API: Improve TransportClient in sniff mode to be more lightweight on connections and API (#1898)
• Mapping: Allow to specify enabled set to false on a property without specifying the type (#1959)
• Network: Add network.address.serialization.resolve setting (defaults to false) to always resolve publish address based on host name (#1899)
• Percolator Index: Don’t index the query element in a percolated query (#1949)
• Query DSL: filtered query to support null filter or {} filter (in which case, just the query is executed) (#1900)
• Query String: Add lenient flag to support value parse failures (#1932)
• Query String URI: Add lenient to the URI q parameters. (#1937)
• Search Preference: Add _shards prefix to explicitly list shards, and add _prefer_node option (#1904)
• Transport Client:
  • When adding an address was already added, ignore it (#1906)
  • Add client.transport.ignore_cluster_name to ignore the cluster name validation, defaults to false (#1910)

Bug fixes:

• ClassCastException during percolation query (#1905)
• When setting index.recovery.initial_shards in the config file, it is ignored (#1912)
• Index Templates settings provided in a config file fails to load properly (#1960)
• Index Merge Scheduler: Configuring using serial fails to load (#1901)
• Mapping:
  • default mapping with dynamic templates can cause them to double on each restart (#1964)
  • Using default mapping _routing mapping definition fails to apply when introducing type through indexing (#1967)
• Percolator:
  • Filtering percolators based on a query can cause wrong matches to be returned (#1925)
  • Wrongly using analyzer configured for the actual index on percolator filtering (#1948)
  • Registering (indexing) a new percolator query will still be stored in memory if actually indexing it fails (#1965)
• Shutdown API: When sending an “all” shutdown, it also shutsdown node clients (#1939)
• deb: ES_HEAP_SIZE not exported (#1947)