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Network
Allow only a fixed-size receive predictor #26165 (issue: #23185 )
REST
Scroll
Fail queries with scroll that explicitely set request_cache #27342
Search
Add a limit to from + size in top_hits and inner hits. #26492 (issue: #11511 )
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Aggregations
Moves deferring code into its own subclass #26421
Core
Unify Settings xcontent reading and writing #26739
Settings
Return List instead of an array from settings #26903
Remove Settings,put(Map<String,String>) #26785
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Aggregations
Deprecate global_ordinals_hash and global_ordinals_low_cardinality #26173 (issue: #26014 )
Allocation
Add deprecation warning for negative index.unassigned.node_left.delayed_timeout #26832 (issue: #26828 )
Analysis
Geo
[GEO] 6x Deprecate ShapeBuilders and decouple geojson parse logic #27345
Mapping
Deprecate the index_options parameter for numeric fields #26672 (issue: #21475 )
Plugin Repository Azure
Azure repository: Move to named configurations as we do for S3 repository and secure settings #23405 (issues: #22762 , #22763 )
Search
doc: deprecate _primary and _replica shard option #26792 (issue: #26335 )
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Aggregations
Aggregations: bucket_sort pipeline aggregation #27152 (issue: #14928 )
Add composite aggregator #26800
Analysis
Added Bengali Analyzer to Elasticsearch with respect to the lucene update #26527
Ingest
Java High Level REST Client
Added Delete Index support to high-level REST client #27019 (issue: #25847 )
Nested Docs
Multi-level Nested Sort with Filters #26395
Query DSL
Add terms_set query #27145 (issue: #26915 )
Introduce sorted_after query for sorted index #26377
Add support for auto_generate_synonyms_phrase_query in match_query, multi_match_query, query_string and simple_query_string #26097
Search
Similarities
Add a scripted similarity. #25831
Suggesters
Expose duplicate removal in the completion suggester #26496 (issue: #23364 )
Support must and should for context query in context suggester #26407 (issues: #24421 , #24565 )
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Aggregations
Allow aggregation sorting via nested aggregation #26683 (issue: #16838 )
Allocation
Tie-break shard path decision based on total number of shards on path #27039 (issue: #26654 )
Balance shards for an index more evenly across multiple data paths #26654 (issue: #16763 )
Expand "NO" decision message in NodeVersionAllocationDecider #26542 (issue: #10403 )
_reroute’s retry_failed flag should reset failure counter #25888 (issue: #25291 )
Analysis
Add configurable max_token_length parameter to whitespace tokenizer #26749 (issue: #26643 )
CRUD
Add wait_for_active_shards parameter to index open command #26682 (issue: #20937 )
Core
Fix classes that can exit #27518
Replace empty index block checks with global block checks in template delete/put actions #27050 (issue: #10530 )
Allow Uid#decodeId to decode from a byte array slice #26987 (issue: #26931 )
Use separate searchers for "search visibility" vs "move indexing buffer to disk #26972 (issues: #15768 , #26802 , #26912 , #3593 )
Add ability to split shards #26931
Make circuit breaker mutations debuggable #26067 (issue: #25891 )
Dates
Discovery
Stop responding to ping requests before master abdication #27329 (issue: #27328 )
Engine
Ensure external refreshes will also refresh internal searcher to minimize segment creation #27253 (issue: #26972 )
Move IndexShard#getWritingBytes() under InternalEngine #27209 (issue: #26972 )
Refactor internal engine #27082
Geo
Add ignore_malformed to geo_shape fields #24654 (issue: #23747 )
Ingest
add json-processor support for non-map json types #27335 (issue: #25972 )
Introduce templating support to timezone/locale in DateProcessor #27089 (issue: #24024 )
Add support for parsing inline script (#23824) #26846 (issue: #23824 )
Consolidate locale parsing. #26400
Accept ingest simulate params as ints or strings #23885 (issue: #23823 )
Internal
Avoid uid creation in ParsedDocument #27241
Upgrade to Lucene 7.1.0 snapshot version #26864 (issue: #26527 )
Remove _index fielddata hack if cluster alias is present #26082 (issue: #25885 )
Java High Level REST Client
Adjust RestHighLevelClient method modifiers #27238
Decouple BulkProcessor from ThreadPool #26727 (issue: #26028 )
Logging
Add more information on failed_to_convert exception (#21946) #27034 (issue: #21946 )
Improve shard-failed log messages. #26866
Mapping
Allow ip_range to accept CIDR notation #27192 (issue: #26260 )
Deduplicate _field_names. #26550
Throw a better error message for empty field names #26543 (issue: #23348 )
Stricter validation for min/max values for whole numbers #26137
Make FieldMapper.copyTo() always non-null. #25994
Nested Docs
Use the primary_term field to identify parent documents #27469 (issue: #24362 )
Prohibit using nested_filter, nested_path and new nested Option at the same time in FieldSortBuilder #26490 (issue: #17286 )
Network
Remove manual tracking of registered channels #27445 (issue: #27260 )
Remove tcp profile from low level nio channel #27441 (issue: #27260 )
Decouple ChannelFactory from Tcp classes #27286 (issue: #27260 )
Percolator
Use Lucene’s CoveringQuery to select percolate candidate matches #27271 (issues: #26081 , #26307 )
Add support to percolate query to percolate multiple documents simultaneously #26418
Hint what clauses are important in a conjunction query based on fields #26081
Add support for selecting percolator query candidate matches containing range queries #25647 (issue: #21040 )
Plugin Discovery EC2
update AWS SDK for ECS Task IAM support in discovery-ec2 #26479 (issue: #23039 )
Plugin Lang Painless
Painless: Only allow Painless type names to be the same as the equivalent Java class. #27264
Allow for the Painless Definition to have multiple instances for white-listing #27096
Separate Painless Whitelist Loading from the Painless Definition #26540
Remove Sort enum from Painless Definition #26179
Plugin Repository Azure
Add azure storage endpoint suffix #26432 #26568 (issue: #26432 )
Support for accessing Azure repositories through a proxy #23518 (issues: #23506 , #23517 )
Plugin Repository S3
Plugins
Plugins: Add versionless alias to all security policy codebase properties #26756 (issue: #26521 )
Allow plugins to plug rescore implementations #26368 (issue: #26208 )
Query DSL
Reindex API
Update by Query is modified to accept short script parameter. #26841 (issue: #24898 )
reindex: automatically choose the number of slices #26030 (issues: #24547 , #25582 )
Rollover
Add size-based condition to the index rollover API #27160 (issue: #27004 )
Add size-based condition to the index rollover API #27115 (issue: #27004 )
Scripting
Script: Convert script query to a dedicated script context #26003
Search
Make fields optional in multi_match query and rely on index.query.default_field by default #27380
fix unnecessary logger creation #27349
ObjectParser : replace IllegalStateException with ParsingException #27302 (issue: #27147 )
Uses norms for exists query if enabled #27237
Cross-cluster search: make remote clusters optional #27182 (issues: #26118 , #27161 )
Enhances exists queries to reduce need for _field_names #26930 (issue: #26770 )
Change ParentFieldSubFetchPhase to create doc values iterator once per segment #26815
Change VersionFetchSubPhase to create doc values iterator once per segment #26809
Change ScriptFieldsFetchSubPhase to create search scripts once per segment #26808 (issue: #26775 )
Make sure SortBuilders rewrite inner nested sorts #26532
Extend testing of build method in ScriptSortBuilder #26520 (issues: #17286 , #26490 )
Accept an array of field names and boosts in the index.query.default_field setting #26320 (issue: #25946 )
Reject IPv6-mapped IPv4 addresses when using the CIDR notation. #26254 (issue: #26078 )
Rewrite range queries with open bounds to exists query #26160 (issue: #22640 )
Sequence IDs
Only fsync global checkpoint if needed #27652
Log primary-replica resync failures #27421 (issues: #24841 , #27418 )
Lazy initialize checkpoint tracker bit sets #27179 (issue: #10708 )
Returns the current primary_term for Get/MultiGet requests #27177 (issue: #26493 )
Settings
Allow affix settings to specify dependencies #27161
Represent lists as actual lists inside Settings #26878 (issue: #26723 )
Remove Settings#getAsMap() #26845
Replace group map settings with affix setting #26819
Throw exception if setting isn’t recognized #26569 (issue: #25607 )
Settings: Move keystore creation to plugin installation #26329 (issue: #26309 )
Snapshot/Restore
Remove XContentType auto detection in BlobStoreRepository #27480
Snapshot: Migrate TransportRequestHandler to TransportMasterNodeAction #27165 (issue: #27151 )
Fix toString of class SnapshotStatus (#26851) #26852 (issue: #26851 )
Stats
Adds average document size to DocsStats #27117 (issue: #27004 )
Stats to record how often the ClusterState diff mechanism is used successfully #27107 (issue: #26973 )
Expose adaptive replica selection stats in /_nodes/stats API #27090
Add cgroup memory usage/limit to OS stats on Linux #26166
Add segment attributes to the _segments API. #26157 (issue: #26130 )
Suggesters
Improve error message for parse failures of completion fields #27297
Support AND operation for context query in context suggester #24565 (issue: #24421 )
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Aggregations
Disable the "low cardinality" optimization of terms aggregations. #27545 (issue: #27543 )
scripted_metric _agg parameter disappears if params are provided #27159 (issues: #19768 , #19863 )
Cluster
Properly format IndexGraveyard deletion date as date #27362
Remove optimisations to reuse objects when applying a new ClusterState #27317
Core
Do not set data paths on no local storage required #27587 (issue: #27572 )
Ensure threadcontext is preserved when refresh listeners are invoked #27565
Ensure logging is configured for CLI commands #27523 (issue: #27521 )
Protect shard splitting from illegal target shards #27468 (issue: #26931 )
Avoid NPE when getting build information #27442
Fix ShardSplittingQuery to respect nested documents. #27398 (issue: #27378 )
When building Settings do not set SecureSettings if empty #26988 (issue: #316 )
Engine
Reset LiveVersionMap on sync commit #27534 (issue: #27516 )
Carry over version map size to prevent excessive resizing #27516 (issue: #20498 )
Geo
Correct two equality checks on incomparable types #27688
[GEO] fix pointsOnly bug for MULTIPOINT #27415
Index Templates
Prevent constructing an index template without index patterns #27662
Ingest
Add pipeline support for REST API bulk upsert #27075 (issue: #25601 )
Fixing Grok pattern for Apache 2.4 #26635
Inner Hits
Return an empty _source for nested inner hit when filtering on a field that doesn’t exist #27531
Internal
When checking if key exists in ThreadContextStruct:putHeaders() method，should put requestHeaders in map first #26068
Adding a refresh listener to a recovering shard should be a noop #26055
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
Mapping
Fix dynamic mapping update generation. #27467
Fix merging of _meta field #27352 (issue: #27323 )
Fixed rounding of bounds in scaled float comparison #27207 (issue: #27189 )
Nested Docs
Ensure nested documents have consistent version and seq_ids #27455
Prevent duplicate fields when mixing parent and root nested includes #27072 (issue: #26990 )
Network
Throw UOE from compressible bytes stream reset #27564 (issue: #24927 )
Bubble exceptions when closing compressible streams #27542 (issue: #27540 )
Do not set SO_LINGER on server channels #26997
Do not set SO_LINGER to 0 when not shutting down #26871 (issue: #26764 )
Close TcpTransport on RST in some Spots to Prevent Leaking TIME_WAIT Sockets #26764 (issue: #26701 )
Packaging
Removes minimum master nodes default number #26803
setgid on /etc/elasticearch on package install #26412 (issue: #26410 )
Percolator
Avoid TooManyClauses exception if number of terms / ranges is exactly equal to 1024 #27519 (issue: #1 )
Plugin Analysis ICU
Catch InvalidPathException in IcuCollationTokenFilterFactory #27202
Plugin Lang Painless
Painless: Fix variable scoping issue in lambdas #27571 (issue: #26760 )
Painless: Fix errors allowing void to be assigned to def. #27460 (issue: #27210 )
Plugin Repository GCS
Create new handlers for every new request in GoogleCloudStorageService #27339 (issue: #27092 )
Recovery
Flush old indices on primary promotion and relocation #27580 (issue: #27536 )
Reindex API
Reindex: Fix headers in reindex action #26937 (issue: #22976 )
Scroll
Fix scroll query with a sort that is a prefix of the index sort #27498
Search
Fix profiling naming issues #27133
Fix max score tracking with field collapsing #27122 (issue: #23840 )
Apply missing request options to the expand phase #27118 (issues: #26649 , #27079 )
Calculate and cache result when advanceExact is called #26920 (issue: #26817 )
Filter unsupported relation for RangeQueryBuilder #26620 (issue: #26575 )
Handle leniency for phrase query on a field indexed without positions #26388
Sequence IDs
Obey translog durability in global checkpoint sync #27641
Fix resync request serialization #27418 (issue: #24841 )
Settings
Allow index settings to be reset by wildcards #27671 (issue: #27537 )
Snapshot/Restore
Do not swallow exception in ChecksumBlobStoreFormat.writeAtomic() #27597
Delete shard store files before restoring a snapshot #27476 (issues: #20220 , #26865 )
Fix snapshot getting stuck in INIT state #27214 (issue: #27180 )
Fix default value of ignore_unavailable for snapshot REST API (#25359) #27056 (issue: #25359 )
Do not create directory on readonly repository (#21495) #26909 (issue: #21495 )
Stats
Include internal refreshes in refresh stats #27615
Make Segment statistics aware of segments hold by internal readers #27558
Ensure doc_stats are changing even if refresh is disabled #27505
Core
Upgrade to Jackson 2.8.10 #27230
Upgrade to Lucene 7.1 #27225
Plugin Discovery EC2
Plugin Discovery GCE
Plugin Lang Painless
Upgrade Painless from ANTLR 4.5.1-1 to ANTLR 4.5.3. #27153