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WARNING: Version 5.6 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.

« 5.6.1 Release Notes 5.5.3 Release Notes »
Elastic Docs ›Elasticsearch Reference [5.6] ›Release Notes

5.6.0 Release Notes

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5.6.0 Release Notes

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Also see Breaking changes in 5.6.

Breaking MSI Windows Installer changes

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Upgrades from 5.5.0, 5.5.1, 5.5.2. See release notes
  • ES_HOME and ES_CONFIG environment variables unset after successful upgrade
  • Windows Service stopped after successful upgrade

Breaking Java changes

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Java High Level REST Client
  • Allow RestHighLevelClient to use plugins #25024
Java REST Client

Deprecations

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Highlighting
  • Postings highlighter deprecation #25073
Indexed Scripts/Templates
  • Scripting: Deprecate stored search template apis #25437 (issue: #24596)
Mapping
  • Add deprecation logging when _all is enabled #26228 (issue: #22144)
Query DSL
  • Deprecate omitting terms lookup index name in 5.6 #25755 (issue: #25750)
Scripting
  • Scripting: Deprecate scripts.max_compilation_per_minute setting #26402
  • Scripting: Change keys for inline/stored scripts to source/id #25127
Tribe Node

New features

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Java High Level REST Client
Parent/Child
  • Typeless parent child backport #25104
  • Move parent_id query to the parent-join module #25072 (issue: #20257)
  • Introduce ParentJoinFieldMapper, a field mapper that creates parent/child relation within documents of the same index #24978 (issue: #20257)
Upgrade API
  • TemplateUpgraders should be called during rolling restart #25263 (issues: #24379, #24680)

Enhancements

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Allocation
  • Adjust status on bad allocation explain requests #25503 (issue: #25458)
  • Promote replica on the highest version node #25277 (issue: #10708)
Analysis
  • [analysis-icu] Allow setting unicodeSetFilter #20814 (issue: #20820)
CAT API
  • expand /_cat/nodes to return information about hard drive #21775 (issue: #21679)
Cluster
  • Validate a joining node’s version with version of existing cluster nodes #25808
Core
  • Add max file size bootstrap check #25974
  • Explicitly reject duplicate data paths #25178
Highlighting
  • Picks offset source for the unified highlighter directly from the es mapping #25747 (issue: #25699)
Index APIs
  • Create index request should return the index name #25139 (issue: #23044)
Ingest
  • Add Ingest-Processor specific Rest Endpoints & Add Grok endpoint #25059 (issue: #24725)
  • Port support for commercial GeoIP2 databases from Logstash. #24889
  • Allow removing multiple fields in ingest processor #24750 (issue: #24622)
  • Add target_field parameter to ingest processors #24133 (issues: #23228, #23682)
Internal
  • Use holder pattern for lazy deprecation loggers #26218 (issue: #26210)
  • "shard started" should show index and shard ID #25157
  • Break out clear scroll logic from TransportClearScrollAction #25125 (issue: #25094)
  • Add helper methods to TransportActionProxy to identify proxy actions and requests #25124
  • Add remote cluster infrastructure to fetch discovery nodes. #25123 (issue: #25094)
  • Disallow multiple parent-join fields per mapping #25002
Java High Level REST Client
  • [DOCS] restructure java clients docs pages #25517
  • Use SPI in High Level Rest Client to load XContent parsers #25098 (issues: #25024, #25097)
Java REST Client
  • Shade external dependencies in the rest client jar #25780 (issue: #25208)
  • RestClient uses system properties and system default SSLContext #25757 (issue: #23231)
Logging
  • Use LRU set to reduce repeat deprecation messages #25474 (issue: #25457)
Mapping
  • Optimize terms queries on ip addresses to use a PointInSetQuery whenever possible. #25669 (issue: #25667)
Network
  • Simplify connection closing and cleanups in TcpTransport #25250
Packaging
  • Remove memlock suggestion from systemd service #25979
  • Set address space limit in systemd service file #25975
Parent/Child
  • Remove ParentJoinFieldSubFetchPhase #25550 (issue: #25363)
  • Support parent id being specified as number in the _source #25547
Query DSL
  • Make slop optional when parsing span_near query #25677 (issue: #25642)
Search
  • Reduce the overhead of timeouts and low-level search cancellation. #25776
  • Reduce profiling overhead. #25772 (issue: #24799)
  • Backport can_match endpoint to 5.6 to allow 6.0 to use the optimization in mixed version #25704 (issue: #25658)
  • Add a shard filter search phase to pre-filter shards based on query rewriting #25658
  • Ensure we rewrite common queries to match_none if possible #25650
  • Limit the number of concurrent shard requests per search request #25632
  • Add cluster name validation to RemoteClusterConnection #25568
  • Leverage scorerSupplier when applicable. #25109
  • Add cross-cluster search support for scroll searches #25094
Sequence IDs
  • 5.x - Move primary term from ReplicationRequest to ConcreteShardRequest #25824 (issue: #25822)
  • Forward compatibility for primary context handoff on 6.x #25545 (issue: #25468)
Settings
  • Emit settings deprecation logging at most once #25457
  • IndexMetaData: Introduce internal format index setting #25292
Snapshot/Restore
  • Improves snapshot logging and snapshot deletion error handling #25264
Stats
  • Update IndexShard#refreshMetric via a ReferenceManager.RefreshListener #25083 (issues: #24806, #25052)

Bug fixes

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Aggregations
  • Fixes array out of bounds for value count agg #26038 (issue: #17379)
Aliases
  • mget with an alias shouldn’t ignore alias routing #25697 (issue: #25696)
Allocation
Analysis
  • Pre-configured shingle filter should disable graph analysis #25853 (issue: #25555)
CRUD
  • Serialize and expose timeout of acknowledged requests in REST layer (ES 5.6) #26213 (issue: #26189)
Cluster
  • Register setting cluster.indices.tombstones.size #26193 (issue: #26191)
Core
  • Release operation permit on thread-pool rejection #25930 (issue: #25863)
  • Node should start up despite of a lingering .es_temp_file #21210 (issue: #21007)
Discovery
  • MasterNodeChangePredicate should use the node instance to detect master change #25877 (issue: #25471)
Engine
  • Engine - Do not store operations that are not index into lucene in the translog (5.x only) #25592
Geo
  • Fix GeoPoint FieldStats ternary logic bug #25211 (issue: #24275)
Highlighting
  • Fix nested query highlighting #26305 (issue: #26230)
  • FastVectorHighlighter should not cache the field query globally #25197 (issue: #25171)
Index APIs
  • Shrink API should ignore templates #25380 (issue: #25035)
  • Rollover max docs should only count primaries #24977 (issue: #24217)
Ingest
  • Sort Processor does not have proper behavior with targetField #25237 (issue: #24133)
Inner Hits
  • Fix inner hits to work with queries wrapped in an indices query #26138 (issue: #26133)
  • When fetching nested inner hits only access stored fields when needed #25864 (issue: #6)
Internal
  • Fix BytesReferenceStreamInput#skip with offset #25634
  • Fix race condition in RemoteClusterConnection node supplier #25432
  • Initialise empty lists in BaseTaskResponse constructor #25290
Java High Level REST Client
  • Register ip_range aggregation with the high level client #26383
  • add top hits as a parsed aggregation to the rest high level client #26370
Logging
  • Lazy initialize deprecation logger in parser #26210 (issue: #25879)
  • Allow not configure logging without config #26209 (issues: #20575, #24076)
  • Declare XContent deprecation logger as static #25881 (issue: #25879)
Mapping
  • ICUCollationKeywordFieldMapper use SortedSetDocValuesField #26267
  • Fixed bug that mapper_parsing_exception is thrown for numeric field with ignore_malformed=true when inserting "NaN" #25967 (issue: #25289)
  • Coerce decimal strings for whole number types by truncating the decimal part #25835 (issue: #25819)
  • Fix parsing of ip range queries. #25768 (issue: #25636)
  • Remove fielddata:false from mappings of non-analyzed strings. #25542
  • Disable date field mapping changing #25285 (issue: #25271)
  • token_count datatype should handle null value #25046 (issue: #24928)
  • keep _parent field while updating child type mapping #24407 (issue: #23381)
Nested Docs
  • In case of a single type the _id field should be added to the nested document instead of _uid field #25149
Network
  • Release pipelined http responses on close #26226
  • Ensure pending transport handlers are invoked for all channel failures #25150
Packaging
  • setgid on /etc/elasticearch on package install #26412 (issue: #26410)
  • Stop disabling explicit GC #25759
  • Avoid failing install if system-sysctl is masked #25657 (issue: #24234)
  • Get short path name for native controllers #25344
  • When stopping via systemd only kill the JVM, not its control group #25195
Parent/Child
  • The default _parent field should not try to load global ordinals #25851 (issue: #25849)
Plugin Lang Painless
  • Painless: allow doubles to be casted to longs. #25936
Plugin Repository HDFS
  • Upgrading HDFS Repository Plugin to use HDFS 2.8.1 Client #25497 (issue: #25450)
Query DSL
  • Parse "*" in query_string_query as MatchAllDocsQuery #25872 (issues: #25556, #25726)
  • SpanNearQueryBuilder should return the inner clause when a single clause is provided #25856 (issue: #25630)
  • WrapperQueryBuilder should also rewrite the parsed query #25480
REST
  • Fix handling of exceptions thrown on HEAD requests #25172 (issue: #21125)
Search
  • Fix term(s) query for range field #25918
  • Caching a MinDocQuery can lead to wrong results. #25909
  • First increment shard stats before notifying and potentially sending response #25818
  • Remove assertion about deviation when casting to a float. #25806 (issue: #25330)
  • Prevent skipping shards if a suggest builder is present #25739 (issue: #25658)
  • Ensure remote cluster alias is preserved in inner hits aggs #25627 (issue: #25606)
  • Do not search locally if remote index pattern resolves to no indices #25436 (issue: #25426)
Settings
  • Fix settings serialization to not serialize secure settings or not take the total size into account #25323
  • Keystore CLI should use the AddFileKeyStoreCommand for files #25298
Snapshot/Restore
  • Snapshot/Restore: fix NPE while handling null failure reasons #26127 (issues: #25878, #25941)
  • Snapshot/Restore: Ensure that shard failure reasons are correctly stored in CS #25941 (issue: #25878)
  • Output all empty snapshot info fields if in verbose mode #25455 (issue: #24477)
Stats
  • _nodes/stats should not fail due to concurrent AlreadyClosedException #25016 (issue: #23099)
Suggesters
  • Context suggester should filter doc values field #25858 (issue: #25404)

Upgrades

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Network
Upgrade API
  • Improve stability and logging of TemplateUpgradeServiceIT tests #25386 (issue: #25382)
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