Also see Breaking changes in 2.3.
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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
-
-
Add per-index setting to limit number of nested fields #15989 (issue: #14983)
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Geo
-
-
Plugin Discovery Multicast
-
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Query DSL
-
-
Add deprecation logging for deprecated queries. #16901 (issue: #16885)
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Reindex API
-
-
Backport reindex to 2.x #17060
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Task Manager
-
-
Backport of task management api to 2x #16959
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Allocation
-
-
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
-
-
Make TermsQuery considered costly. #16851
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Cluster
-
-
Shard state action request logging #16396
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Safe cluster state task notifications #15777
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Core
-
-
Remove log4j exception hiding #16834
-
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
-
-
Added file name to exceptions when failing to read index state #16850 (issue: #16713)
-
Add Exception class name to message in
NotSerializableExceptionWrapper
#16325
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Geo
-
-
Upgrade GeoPointField to use Lucene 5.5 PrefixEncoding #16482
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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)
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Logging
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-
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)
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Make mapping updates more robust. #15539
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Network
-
-
Add additional fallback to http.publish_port and restrict fallback to transport.publish_port #16626 (issue: #14535)
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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)
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Plugin Cloud Azure
-
-
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
-
-
REST
-
-
More robust handling of CORS HTTP Access Control #16436
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Reindex API
-
-
Implement helpful interfaces in reindex requests #17032
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Reindex should timeout if sub-requests timeout #16962
-
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)
-
Remove suppressAccessChecks permission for Groovy script plugin #16839 (issue: #16527)
-
Class permission for Groovy references #16660 (issue: #16657)
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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
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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)
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Settings
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-
Log warning if max file descriptors too low #16506
-
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)
-
Set meta data for pipeline aggregations #16516 (issue: #16484)
-
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
-
-
Fix _aliases filter and null parameters #16553 (issues: #16547, #16549)
-
Check lenient_expand_open after aliases have been resolved #15882 (issue: #13278)
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Allocation
-
-
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
-
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)
-
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)
-
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)