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WARNING: Version 2.3 of Elasticsearch has passed its EOL date.

This documentation is no longer being maintained and may be removed. If you are running this version, we strongly advise you to upgrade. For the latest information, see the current release documentation.

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Elastic Docs ›Elasticsearch Guide [2.3] ›Release Notes

2.3.0 Release Notes

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2.3.0 Release Notes

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Also see Breaking changes in 2.3.

Breaking changes

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Allocation
  • Speed up shard balancer by reusing shard model while moving shards that can no longer be allocated to a node #16926
Mapping
  • Add per-index setting to limit number of nested fields #15989 (issue: #14983)

Deprecations

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Geo
Plugin Discovery Multicast
  • Deprecate Discovery Multicast Plugin #16949 (issue: #16910)
Query DSL
  • Add deprecation logging for deprecated queries. #16901 (issue: #16885)

New features

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Reindex API
  • Backport reindex to 2.x #17060
Task Manager
  • Backport of task management api to 2x #16959

Enhancements

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Allocation
  • Skip capturing least/most FS info for an FS with no total #16001 (issue: #15919)
  • Speed improvements for BalancedShardsAllocator #15678 (issue: #6372)
Cache
  • Make TermsQuery considered costly. #16851
Cluster
  • Shard state action request logging #16396
  • Safe cluster state task notifications #15777
Core
  • Remove log4j exception hiding #16834
  • Avoid cloning MessageDigest instances #16479
  • Add a hard check to ensure we are running with the expected lucene version #16305 (issue: #16301)
Exceptions
  • Added file name to exceptions when failing to read index state #16850 (issue: #16713)
  • Add Exception class name to message in NotSerializableExceptionWrapper #16325
Geo
  • Upgrade GeoPointField to use Lucene 5.5 PrefixEncoding #16482
Internal
  • Cleanup search sub transport actions and collapse o.e.action.search.type package into o.e.action.search #16758 (issue: #11710)
Java API
  • TransportClient: Add exception when using plugin.types, to help migration to addPlugin #15943 (issue: #15693)
Logging
Mapping
  • Add deprecation logging for mapping transform #16952 (issue: #16910)
  • Expose the reason why a mapping merge is issued. #16059 (issue: #15989)
  • Add sub-fields support to bool fields. #15636 (issue: #6587)
  • Improve cross-type dynamic mapping updates. #15633 (issue: #15568)
  • Make mapping updates more robust. #15539
Network
  • Add additional fallback to http.publish_port and restrict fallback to transport.publish_port #16626 (issue: #14535)
Packaging
  • Windows service: Use JAVA_HOME environment variable in registry #16552 (issue: #13521)
  • Default standard output to the journal in systemd #16159 (issues: #15315, #16134)
  • Use egrep instead of grep -E for Solaris #15755 (issue: #15628)
Plugin Cloud Azure
Plugin Discovery EC2
  • Add ap-northeast-2 (seoul) endpoints for EC2 discovery and S3 snapshots #16167 (issue: #16166)
Plugin Mapper Attachment
REST
  • More robust handling of CORS HTTP Access Control #16436
Reindex API
  • Implement helpful interfaces in reindex requests #17032
  • Reindex should timeout if sub-requests timeout #16962
  • Teach reindex to retry on rejection #16556 (issue: #16093)
Scripting
  • Logs old script params use to the Deprecation Logger #16950 (issue: #16910)
  • Remove suppressAccessChecks permission for Groovy script plugin #16839 (issue: #16527)
  • Class permission for Groovy references #16660 (issue: #16657)
  • Scripting: Allow to get size of array in mustache #16193
  • Added plumbing for compile time script parameters #16163 (issue: #15464)
  • Enhancements to the mustache script engine #15661
Search
  • Add deprecation logging for ignore_unmapped parameter #17002 (issues: #16573, #16910)
  • Add deprecation logging when users use the SCAN search type. #16980 (issue: #16910)
Settings
  • Log warning if max file descriptors too low #16506

Bug fixes

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Aggregations
  • Setting other bucket on empty aggregation #17264 (issue: #16546)
  • Build empty extended stats aggregation if no docs collected for bucket #16972 (issues: #16812, #9544)
  • Set meta data for pipeline aggregations #16516 (issue: #16484)
  • Filter(s) aggregation should create weights only once. #15998
  • Make missing on terms aggs work with all execution modes. #15746 (issue: #14882)
  • Fix NPE in Derivative Pipeline when current bucket value is null #14745
Aliases
  • Fix _aliases filter and null parameters #16553 (issues: #16547, #16549)
  • Check lenient_expand_open after aliases have been resolved #15882 (issue: #13278)
Allocation
  • IndicesStore checks for allocated elsewhere for every shard not alocated on the local node #17106
  • Prevent peer recovery from node with older version #15775
Analysis
  • Analysis : Allow string explain param in JSON #16977 (issue: #16925)
  • Analysis : Fix no response from Analyze API without specified index #15447 (issue: #15148)
Bulk
  • Bulk api: fail deletes when routing is required but not specified #16675 (issues: #10136, #16645)
CAT API
  • Fix column aliases in _cat/indices, _cat/nodes and _cat/shards APIs #17145 (issue: #17101)
CRUD
  • fixed propagation of autoGeneratedId on document creation #16767
  • Throw exception if content type could not be determined in Update API #15904 (issue: #15822)
Cache
  • Handle closed readers in ShardCoreKeyMap #16027
Cluster
  • Index deletes not applied when cluster UUID has changed #16825 (issue: #11665)
  • Only fail the relocation target when a replication request on it fails #15791 (issue: #15790)
Core
  • Migrate template settings (add missing byte & time units) #17095 (issue: #17093)
Fielddata
  • Make disabled fielddata loading fail earlier. #16179 (issue: #16135)
Geo
  • Remove .geohash suffix from GeoDistanceQuery and GeoDistanceRangeQuery #15871 (issue: #15179)
Highlighting
  • Don’t override originalQuery with request filters #15793 (issue: #15689)
Inner Hits
  • Query and top level inner hit definitions shouldn’t overwrite each other #16222 (issue: #16218)
Internal
  • Log uncaught exceptions from scheduled once tasks #15824 (issue: #15814)
  • FunctionScoreQuery should implement two-phase iteration. #15602
Java API
Logging
  • Add missing index name to indexing slow log #17026 (issue: #17025)
  • ParseFieldMatcher should log when using deprecated settings. #16988
Mapping
  • Put mapping operations must update metadata of all types. #16264 (issue: #16239)
  • Fix serialization of search_analyzer. #16255
  • Reuse metadata mappers for dynamic updates. #16023 (issue: #15997)
  • Fix MapperService#searchFilter(…​) #15923 (issue: #15757)
  • MapperService: check index.mapper.dynamic during index creation #15424 (issue: #15381)
Network
  • Only accept transport requests after node is fully initialized #16746 (issue: #16723)
Packaging
Parent/Child
  • Check that parent_type in Has Parent Query has child types #16923 (issue: #16692)
  • Has child query forces default similarity #16611 (issues: #16550, #4977)
Percolator
  • Don’t replace found fields if map unmapped fields as string is enabled #16043 (issue: #10500)
  • mpercolate api should serialise start time #15938 (issue: #15908)
Plugin Cloud Azure
  • Fix calling ensureOpen() on the wrong directory #16383
Plugin Discovery GCE
  • Add setFactory permission to GceDiscoveryPlugin #16860 (issue: #16485)
Query DSL
  • Fix FunctionScore equals/hashCode to include minScore and friends #15676
REST
  • Remove detect_noop from REST spec #16386
  • Make text parsing less lenient. #15679
Recovery
  • Try to renew sync ID if flush=true on forceMerge #17108 (issue: #17019)
  • sync translog to disk after recovery from primary #15832
Reindex API
  • Properly register reindex status #17125
  • Be much much much careful about context #17122
  • Make search failure cause rest failure #16889 (issue: #16037)
Scripting
  • Check that _value is used in aggregations script before setting value to specialValue #17091 (issue: #14262)
  • Add permission to access sun.reflect.MethodAccessorImpl from Groovy scripts #16540 (issue: #16536)
  • Fixes json generation for scriptsort w/ deprecated params #16261 (issue: #16260)
  • Security permissions for Groovy closures #16196 (issues: #16194, #248)
Search
  • Do not apply minimum_should_match on auto generated boolean query if the coordination factor is disabled. #16155
  • Do not apply minimum-should-match on a boolean query if the coords are disabled #16078 (issue: #15858)
  • Fix blended terms take 2 #15894 (issue: #15860)
Settings
  • TransportClient should use updated setting for initialization of modules and service #16095
Snapshot/Restore
  • Prevent closing index during snapshot restore #16933 (issue: #16321)
  • Add node version check to shard allocation during restore #16520 (issue: #16519)
Stats
  • Fix recovery translog stats totals when recovering from store #16493 (issue: #15974)
  • Fix calculation of age of pending tasks #15995 (issue: #15988)
Task Manager
  • Fix TaskId#isSet to return true when id is set and not other way around #17307
  • Don’t wait for completion of list tasks tasks when wait_for_completion flag is set #17231
Translog
  • Call ensureOpen on Translog#newView() to prevent IllegalStateException #17191
  • Make sure IndexShard is active during recovery so it gets its fair share of the indexing buffer #16209 (issue: #16206)
  • Avoid circular reference in exception #15952 (issue: #15941)
  • Initialize translog before scheduling the sync to disk #15881
  • Catch tragic even inside the checkpoint method rather than on the caller side #15825
  • Never delete translog-N.tlog file when creation fails #15788
  • Close recovered translog readers if createWriter fails #15762 (issue: #15754)
Tribe Node
  • Passthrough environment and network settings to tribe client nodes #16893
  • Tribe node: pass path.conf to inner tribe clients #16258 (issue: #16253)

Regressions

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Analysis
  • Add PathHierarchy type back to path_hierarchy tokenizer for backward compatibility with 1.x #15785 (issue: #15756)
Plugin Cloud Azure
REST
  • Don’t return all indices immediately if count of expressions >1 and first expression is * #17033 (issue: #17027)

Upgrades

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Core
  • Upgrade to Lucene 5.5.0 official release #16742
  • Upgrade to lucene 5.5.0-snapshot-850c6c2 #16615
  • Upgrade to lucene 5.5.0-snapshot-4de5f1d #16400 (issues: #16373, #16399)
  • Update lucene to r1725675 #16114
  • Upgrade to lucene-5.5.0-snapshot-1721183. #15575
Plugin Cloud Azure
Plugin Discovery Azure
Scripting
  • Upgrade groovy dependency in lang-groovy module to version 2.4.6 #16830 (issue: #16527)
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