Also see Breaking changes in 2.3.
Breaking changesedit
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Allocation
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Speed up shard balancer by reusing shard model while moving shards that can no longer be allocated to a node #16926
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Mapping
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Add per-index setting to limit number of nested fields #15989 (issue: #14983)
Deprecationsedit
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Geo
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Plugin Discovery Multicast
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Query DSL
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Add deprecation logging for deprecated queries. #16901 (issue: #16885)
New featuresedit
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Reindex API
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Backport reindex to 2.x #17060
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Task Manager
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Backport of task management api to 2x #16959
Enhancementsedit
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Allocation
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Skip capturing least/most FS info for an FS with no total #16001 (issue: #15919)
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Speed improvements for BalancedShardsAllocator #15678 (issue: #6372)
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Cache
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Make TermsQuery considered costly. #16851
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Cluster
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Shard state action request logging #16396
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Safe cluster state task notifications #15777
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Core
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Remove log4j exception hiding #16834
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Avoid cloning MessageDigest instances #16479
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Add a hard check to ensure we are running with the expected lucene version #16305 (issue: #16301)
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Exceptions
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Added file name to exceptions when failing to read index state #16850 (issue: #16713)
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Add Exception class name to message in
NotSerializableExceptionWrapper #16325
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Geo
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Upgrade GeoPointField to use Lucene 5.5 PrefixEncoding #16482
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Internal
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Cleanup search sub transport actions and collapse o.e.action.search.type package into o.e.action.search #16758 (issue: #11710)
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Java API
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TransportClient: Add exception when using plugin.types, to help migration to addPlugin #15943 (issue: #15693)
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Logging
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Mapping
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Add deprecation logging for mapping transform #16952 (issue: #16910)
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Expose the reason why a mapping merge is issued. #16059 (issue: #15989)
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Add sub-fields support to
bool fields. #15636 (issue: #6587)
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Improve cross-type dynamic mapping updates. #15633 (issue: #15568)
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Make mapping updates more robust. #15539
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Network
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Add additional fallback to http.publish_port and restrict fallback to transport.publish_port #16626 (issue: #14535)
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Packaging
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Windows service: Use JAVA_HOME environment variable in registry #16552 (issue: #13521)
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Default standard output to the journal in systemd #16159 (issues: #15315, #16134)
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Use egrep instead of grep -E for Solaris #15755 (issue: #15628)
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Plugin Cloud Azure
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Plugin Discovery EC2
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Add ap-northeast-2 (seoul) endpoints for EC2 discovery and S3 snapshots #16167 (issue: #16166)
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Plugin Mapper Attachment
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REST
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More robust handling of CORS HTTP Access Control #16436
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Reindex API
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Implement helpful interfaces in reindex requests #17032
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Reindex should timeout if sub-requests timeout #16962
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Teach reindex to retry on rejection #16556 (issue: #16093)
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Scripting
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Logs old script params use to the Deprecation Logger #16950 (issue: #16910)
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Remove suppressAccessChecks permission for Groovy script plugin #16839 (issue: #16527)
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Class permission for Groovy references #16660 (issue: #16657)
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Scripting: Allow to get size of array in mustache #16193
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Added plumbing for compile time script parameters #16163 (issue: #15464)
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Enhancements to the mustache script engine #15661
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Search
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Add deprecation logging for ignore_unmapped parameter #17002 (issues: #16573, #16910)
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Add deprecation logging when users use the SCAN search type. #16980 (issue: #16910)
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Settings
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Log warning if max file descriptors too low #16506
Bug fixesedit
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Aggregations
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Setting other bucket on empty aggregation #17264 (issue: #16546)
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Build empty extended stats aggregation if no docs collected for bucket #16972 (issues: #16812, #9544)
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Set meta data for pipeline aggregations #16516 (issue: #16484)
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Filter(s) aggregation should create weights only once. #15998
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Make
missing on terms aggs work with all execution modes. #15746 (issue: #14882)
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Fix NPE in Derivative Pipeline when current bucket value is null #14745
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Aliases
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Fix _aliases filter and null parameters #16553 (issues: #16547, #16549)
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Check lenient_expand_open after aliases have been resolved #15882 (issue: #13278)
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Allocation
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IndicesStore checks for
allocated elsewhere for every shard not alocated on the local node #17106
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Prevent peer recovery from node with older version #15775
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Analysis
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Analysis : Allow string explain param in JSON #16977 (issue: #16925)
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Analysis : Fix no response from Analyze API without specified index #15447 (issue: #15148)
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Bulk
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Bulk api: fail deletes when routing is required but not specified #16675 (issues: #10136, #16645)
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CAT API
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Fix column aliases in _cat/indices, _cat/nodes and _cat/shards APIs #17145 (issue: #17101)
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CRUD
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fixed propagation of autoGeneratedId on document creation #16767
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Throw exception if content type could not be determined in Update API #15904 (issue: #15822)
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Cache
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Handle closed readers in ShardCoreKeyMap #16027
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Cluster
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Index deletes not applied when cluster UUID has changed #16825 (issue: #11665)
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Only fail the relocation target when a replication request on it fails #15791 (issue: #15790)
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Core
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Migrate template settings (add missing byte & time units) #17095 (issue: #17093)
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Fielddata
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Make disabled fielddata loading fail earlier. #16179 (issue: #16135)
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Geo
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Remove .geohash suffix from GeoDistanceQuery and GeoDistanceRangeQuery #15871 (issue: #15179)
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Highlighting
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Don’t override originalQuery with request filters #15793 (issue: #15689)
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Inner Hits
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Query and top level inner hit definitions shouldn’t overwrite each other #16222 (issue: #16218)
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Internal
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Log uncaught exceptions from scheduled once tasks #15824 (issue: #15814)
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FunctionScoreQuery should implement two-phase iteration. #15602
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Java API
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Logging
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Add missing index name to indexing slow log #17026 (issue: #17025)
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ParseFieldMatcher should log when using deprecated settings. #16988
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Mapping
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Put mapping operations must update metadata of all types. #16264 (issue: #16239)
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Fix serialization of
search_analyzer. #16255
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Reuse metadata mappers for dynamic updates. #16023 (issue: #15997)
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Fix MapperService#searchFilter(…) #15923 (issue: #15757)
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MapperService: check index.mapper.dynamic during index creation #15424 (issue: #15381)
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Network
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Only accept transport requests after node is fully initialized #16746 (issue: #16723)
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Packaging
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Parent/Child
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Check that parent_type in Has Parent Query has child types #16923 (issue: #16692)
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Has child query forces default similarity #16611 (issues: #16550, #4977)
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Percolator
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Don’t replace found fields if map unmapped fields as string is enabled #16043 (issue: #10500)
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mpercolate api should serialise start time #15938 (issue: #15908)
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Plugin Cloud Azure
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Fix calling ensureOpen() on the wrong directory #16383
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Plugin Discovery GCE
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Add setFactory permission to GceDiscoveryPlugin #16860 (issue: #16485)
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Query DSL
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Fix FunctionScore equals/hashCode to include minScore and friends #15676
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REST
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Remove detect_noop from REST spec #16386
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Make text parsing less lenient. #15679
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Recovery
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Try to renew sync ID if
flush=true on forceMerge #17108 (issue: #17019)
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sync translog to disk after recovery from primary #15832
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Reindex API
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Properly register reindex status #17125
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Be much much much careful about context #17122
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Make search failure cause rest failure #16889 (issue: #16037)
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Scripting
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Check that _value is used in aggregations script before setting value to specialValue #17091 (issue: #14262)
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Add permission to access sun.reflect.MethodAccessorImpl from Groovy scripts #16540 (issue: #16536)
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Fixes json generation for scriptsort w/ deprecated params #16261 (issue: #16260)
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Security permissions for Groovy closures #16196 (issues: #16194, #248)
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Search
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Do not apply minimum_should_match on auto generated boolean query if the coordination factor is disabled. #16155
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Do not apply minimum-should-match on a boolean query if the coords are disabled #16078 (issue: #15858)
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Fix blended terms take 2 #15894 (issue: #15860)
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Settings
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TransportClient should use updated setting for initialization of modules and service #16095
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Snapshot/Restore
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Prevent closing index during snapshot restore #16933 (issue: #16321)
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Add node version check to shard allocation during restore #16520 (issue: #16519)
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Stats
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Fix recovery translog stats totals when recovering from store #16493 (issue: #15974)
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Fix calculation of age of pending tasks #15995 (issue: #15988)
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Task Manager
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Fix TaskId#isSet to return true when id is set and not other way around #17307
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Don’t wait for completion of list tasks tasks when wait_for_completion flag is set #17231
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Translog
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Call ensureOpen on Translog#newView() to prevent IllegalStateException #17191
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Make sure IndexShard is active during recovery so it gets its fair share of the indexing buffer #16209 (issue: #16206)
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Avoid circular reference in exception #15952 (issue: #15941)
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Initialize translog before scheduling the sync to disk #15881
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Catch tragic even inside the checkpoint method rather than on the caller side #15825
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Never delete translog-N.tlog file when creation fails #15788
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Close recovered translog readers if createWriter fails #15762 (issue: #15754)
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Tribe Node
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Passthrough environment and network settings to tribe client nodes #16893
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Tribe node: pass path.conf to inner tribe clients #16258 (issue: #16253)
Regressionsedit
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Analysis
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Add PathHierarchy type back to path_hierarchy tokenizer for backward compatibility with 1.x #15785 (issue: #15756)
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Plugin Cloud Azure
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REST
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Don’t return all indices immediately if count of expressions >1 and first expression is * #17033 (issue: #17027)
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Core
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Upgrade to Lucene 5.5.0 official release #16742
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Upgrade to lucene 5.5.0-snapshot-850c6c2 #16615
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Upgrade to lucene 5.5.0-snapshot-4de5f1d #16400 (issues: #16373, #16399)
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Update lucene to r1725675 #16114
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Upgrade to lucene-5.5.0-snapshot-1721183. #15575
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Plugin Cloud Azure
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Plugin Discovery Azure
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Scripting
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Upgrade groovy dependency in lang-groovy module to version 2.4.6 #16830 (issue: #16527)