› ›

Elasticsearch version 7.6.0

Also see Breaking changes in 7.6.

Known issues

Applying deletes or updates on an index after it has been shrunk may corrupt the index. In order to prevent this issue, it is recommended to stop shrinking read-write indices. For read-only indices, it is recommended to force-merge indices after shrinking, which significantly reduces the likeliness of this corruption in the case that deletes/updates would be applied by mistake. This bug is fixed in Elasticsearch 7.7 and later versions. More details can be found on the corresponding issue.
Indices created in 6.x with date and date_nanos fields using formats that are incompatible with java.time patterns will cause parsing errors, incorrect date calculations or wrong search results. https://github.com/elastic/elasticsearch/pull/52555 This is fixed in Elasticsearch 7.7 and later versions.
Slow loggers can cause Log4j loggers to leak over time. When a new index is created, a new Log4j logger is associated with it. However, when an index is deleted, Log4j keeps an internal reference to its loggers that results in a memory leak (issue: #56171)

This issue is fixed in Elasticsearch 6.8.10 and 7.7.1.
Week-based date patterns are not working correctly with Y. Using Y with w will result in a failed request and an exception in the logs (issue: #57128). Using y with w results in incorrect date calculations. A workaround is to add the following line to the jvm.options file.
```
9-:-Djava.locale.providers=SPI,COMPAT
```
This issue is fixed in Elasticsearch 7.7.0 and later versions (issue: #50916).

Breaking changes

Breaking Java changes

Security

Support Client and RoleMapping in custom Realms #50534 (issue: #48369)

Deprecations

Analysis

Deprecate and remove camel-case nGram and edgeNGram tokenizers #50862 (issue: #50561)

Authorization

Deprecating kibana_user and kibana_dashboard_only_user roles #46456

Distributed

Deprecate synced flush #50835 (issue: #50776)
Deprecate indices without soft-deletes #50502

Features/Indices APIs

Emit warnings when index templates have multiple mappings #50982
Ensure we emit a warning when using the deprecated template field. #50831 (issue: #49460)

Infra/Core

Deprecate the local parameter of /_cat/nodes #50499 (issue: #50088)

Reindex

Deprecate sorting in reindex #49458 (issue: #47567)

Search

Deprecate loading fielddata on _id field #49166 (issues: #26472, #43599)
Update the signature of vector script functions. #48604
Deprecate the sparse_vector field type. #48315
Add a deprecation warning regarding allocation awareness in search request #48351 (issue: #43453)

New features

Aggregations

New Histogram field mapper that supports percentiles aggregations. #48580 (issue: #48578)
Implement stats aggregation for string terms #47468

Analysis

Implement Lucene EstonianAnalyzer, Stemmer #49149 (issue: #48895)

Authentication

Password Protected Keystore (Feature Branch) #49210

Features/ILM+SLM

ILM action to wait for SLM policy execution #50454 (issue: #45067)
Add ILM histore store index #50287 (issue: #49180)

Features/Ingest

CSV processor #49509 (issue: #49113)

Machine Learning

Implement precision and recall metrics for classification evaluation #49671 (issue: #48759)
Explain data frame analytics API #49455
Machine learning model inference ingest processor #49052
Implement accuracy metric for multi-class classification #47772 (issue: #48759)
Add feature importance values to classification and regression results (using tree SHapley Additive exPlanation, or SHAP) #857

Mapping

Add per-field metadata. #49419 (issue: #33267)

Search

Add fuzzy intervals source #49762 (issue: #49595)
Add a listener to track the progress of a search request locally #49471 (issue: #49091)

Enhancements

Aggregations

Add reusable HistogramValue object #49799 (issue: #49683)
Optimize composite aggregation based on index sorting #48399 (issue: #48130)

Allocation

Auto-expand indices according to allocation filtering rules #48974
Do not cancel ongoing recovery for noop copy on broken node #48265 (issue: #47974)
Quieter logging from the DiskThresholdMonitor #48115 (issue: #48038)
Faster access to INITIALIZING/RELOCATING shards #47817 (issues: #46941, #48579)

Analysis

Check for deprecations when analyzers are built #50908 (issue: #42349)
Make Multiplexer inherit filter chains analysis mode #50662 (issue: #50554)
Allow custom characters in token_chars of ngram tokenizers #49250 (issue: #25894)

Authentication

Add Debug/Trace logging for authentication #49575 (issue: #49473)

Authorization

Increase Size and lower TTL on DLS BitSet Cache #50535 (issues: #43669, #49260)
Add monitor_snapshot cluster privilege #50489 (issue: #50210)
Remove reserved roles for code search #50068 (issue: #49842)
[Code] Remove code_admin/code_user roles #48164
Resolve the role query and the number of docs lazily #48036

CCR

Improve error message when pausing index #48915
Use MultiFileTransfer in CCR remote recovery #44514 (issue: #44468)

CRUD

print id detail when id is too long. #49433
Add preflight check to dynamic mapping updates #48817 (issue: #35564)

Cluster Coordination

Move metadata storage to Lucene #50907 (issue: #48701)
Remove custom metadata tool #50813 (issue: #48701)

Distributed

Use retention lease in peer recovery of closed indices #48430 (issue: #45136)

Engine

Do not force refresh when write indexing buffer #50769
Deleted docs disregarded for if_seq_no check #50526
Allow realtime get to read from translog #48843
Do not warm up searcher in engine constructor #48605 (issue: #47186)
Add a new merge policy that interleaves old and new segments on force merge #48533 (issue: #37043)
Refresh should not acquire readLock #48414 (issue: #47186)

Features/ILM+SLM

Refresh cached phase policy definition if possible on new poli… #50820 (issue: #48431)
Make the UpdateRolloverLifecycleDateStep retryable #50702 (issue: #48183)
Make InitializePolicyContextStep retryable #50685 (issue: #48183)
ILM retryable async action steps #50522 (issues: #44135, #48183)
Make the TransportRolloverAction execute in one cluster state update #50388
ILM open/close steps are noop if idx is open/close #48614
ILM Make the check-rollover-ready step retryable #48256 (issue: #44135)

Features/Ingest

Foreach processor - fork recursive call #50514
Sync grok patterns with logstash patterns #50381
Replace required pipeline with final pipeline #49470 (issue: #49247)
Add templating support to enrich processor #49093
Introduce on_failure_pipeline ingest metadata inside on_failure block #49076 (issue: #44920)
Add templating support to pipeline processor. #49030 (issue: #39955)
Add option to split processor for preserving trailing empty fields #48664 (issue: #48498)
Change grok watch dog to be Matcher based instead of thread based. #48346 (issues: #43673, #47374)
update ingest-user-agent regexes.yml #47807

Features/Java High Level REST Client

Add remote info to the HLRC #49657 (issue: #47678)
Add delete alias to the HLRC #48819 (issue: #47678)

Features/Monitoring

Significantly Lower Monitoring HttpExport Memory Footprint #48854
Validate proxy base path at parse time #47912 (issue: #47711)
Validate index name time format setting at parse time #47911 (issue: #47711)
Validate monitoring header overrides at parse time #47848 (issue: #47711)
Validate monitoring username at parse time #47821 (issue: #47711)
Validate monitoring password at parse time #47740 (issue: #47711)

Features/Stats

Add ingest info to Cluster Stats #48485 (issue: #46146)

Features/Watcher

Log attachment generation failures #50080
Don’t dump a stacktrace for invalid patterns when executing elasticse… #49744 (issue: #49642)

Geo

"CONTAINS" support for BKD-backed geo_shape and shape fields #50141 (issue: #41204)
Adds support for geo-bounds filtering in geogrid aggregations #50002
Introduce faster approximate sinh/atan math functions #49009 (issue: #41166)
Add IndexOrDocValuesQuery to GeoPolygonQueryBuilder #48449

Infra/Core

Add "did you mean" to ObjectParser #50938
Consistent case in CLI option descriptions #49635
Improve resiliency to formatting JSON in server #48553 (issue: #48450)
Don’t close stderr under --quiet #47208 (issue: #46900)

Infra/Packaging

Respect ES_PATH_CONF on package install #50158
Restrict support for CMS to pre-JDK 14 #49123 (issue: #46973)
Remove parsed JVM settings from general settings in Windows service daemon manager #49061 (issue: #48796)
Package the JDK into jdk.app on macOS #48765
Add UBI-based Docker images #48710 (issue: #48429)

Infra/Plugins

Report progress of multiple plugin installs #51001 (issue: #50924)
Allow installing multiple plugins as a transaction #50924 (issue: #50443)

Infra/Scripting

Scripting: ScriptFactory not required by compile #50344 (issue: #49466)
Scripting: Cache script results if deterministic #50106 (issue: #49466)
Scripting: Groundwork for caching script results #49895 (issue: #49466)
Scripting: add available languages & contexts API #49652 (issue: #49463)
Scripting: fill in get contexts REST API #48319 (issue: #47411)
Scripting: get context names REST API #48026 (issue: #47411)

Infra/Settings

Add parameter to make sure that log of updating IndexSetting be more detailed #49969 (issue: #49818)
Enable dependent settings values to be validated #49942
Do not reference values for filtered settings #48066

License

Add max_resource_units to enterprise license #50735
Add setting to restrict license types #49418 (issue: #48508)
Support "enterprise" license types #49223 (issue: #48510)

Machine Learning

Add audit warning for 1000 categories found early in job #51146 (issue: #50749)
Add num_top_feature_importance_values param to regression and classification #50914
Implement force deleting a data frame analytics job #50553 (issue: #48124)
Delete unused data frame analytics state #50243
Make each analysis report desired field mappings to be copied #50219 (issue: #50119)
Retry bulk indexing of state docs #50149 (issue: #50143)
Persist/restore state for data frame analytics classification #50040
Introduce randomize_seed setting for regression and classification #49990
Pass prediction_field_type to C++ analytics process #49861 (issue: #49796)
Add optional source filtering during data frame reindexing #49690 (issue: #49531)
Add default categorization analyzer definition to ML info #49545
Add graceful retry for anomaly detector result indexing failures #49508 (issue: #45711)
Lower minimum model memory limit value for data frame analytics jobs from 1MB to 1kB #49227 (issue: #49168)
Improve model_memory_limit user experience for data frame analytics jobs #44699
Improve performance of boosted tree training for both classification and regression #775
Reduce the peak memory used by boosted tree training and fix an overcounting bug estimating maximum memory usage #781
Stratified fractional cross validation for regression #784
Added geo_point supported output for lat_long function records #809, #47050
Use a random bag of the data to compute the loss function derivatives for each new tree which is trained for both regression and classification #811
Emit prediction_probability field alongside prediction field in ml results #818
Reduce memory usage of machine learning native processes on Windows #844
Reduce runtime of classification and regression #863
Stop early training a classification and regression forest when the validation error is no longer decreasing #875
Emit prediction_field_name in data frame analytics results using the type provided as prediction_field_type parameter #877
Improve performance updating quantile estimates #881
Migrate to use Bayesian optimisation for initial hyperparameter value line searches and stop early if the expected improvement is too small #903
Stop cross-validation early if the predicted test loss has a small chance of being smaller than for the best parameter values found so far #915
Optimize decision threshold for classification to maximize minimum class recall #926
Include categorization memory usage in the model_bytes field in model_size_stats, so that it is taken into account in node assignment decisions #927 (issue: #724)

Mapping

Add telemetry for flattened fields. #48972

Network

Add certutil http command #49827
Do not load SSLService in plugin contructor #49667 (issue: #44536)
Netty4: switch to composite cumulator #49478
Add the simple strategy to cluster settings #49414 (issue: #49067)
Deprecate misconfigured SSL server config #49280 (issue: #45892)
Improved diagnostics for TLS trust failures #48911

Percolator

Refactor percolator’s QueryAnalyzer to use QueryVisitors #49238 (issue: #45639)

Ranking

Support search_type in Rank Evaluation API #48542 (issue: #48503)

Recovery

Use peer recovery retention leases for indices without soft-deletes #50351 (issues: #45136, #46959)
Recovery buffer size 16B smaller #50100

Reindex

Reindex sort deprecation warning take 2 #49855 (issue: #49458)

SQL

SQL: Handle uberjar scenario where the ES jdbc driver file is bundled in another jar #51856 (issue: #50201)
SQL: add trace logging for search responses coming from server #50530
SQL: Add TRUNC alias for TRUNCATE #49571 (issue: #41195)
SQL: binary communication implementation for drivers and the CLI #48261 (issue: #47785)
SQL: Verify Full-Text Search functions not allowed in SELECT #51568 (issue: #47446)

Search

Add Validation for maxQueryTerms to be greater than 0 for MoreLikeThisQuery #49966 (issue: #49927)
Optimize numeric sort on match_all queries #49717 (issue: #48804)
Pre-sort shards based on the max/min value of the primary sort field #49092 (issue: #49091)
Optimize sort on long field #48804
Search optimisation - add canMatch early aborts for queries on "_index" field #48681 (issue: #48473)
#48475 Pure disjunctions should rewrite to a MatchNoneQueryBuilder #48557
Disable caching when queries are profiled #48195 (issue: #33298)
BlendedTermQuery’s equals method should consider boosts #48193 (issue: #48184)
Increase the number of vector dims to 2048 #46895

Security

Make .async-search-* a restricted namespace #50294
Security should not reload files that haven’t changed #50207 (issue: #50063)

Snapshot/Restore

Use Cluster State to Track Repository Generation #49729 (issue: #49060)
Track Repository Gen. in BlobStoreRepository #48944 (issues: #38941, #47520, #47834, #49048)
Restore from Individual Shard Snapshot Files in Parallel #48110 (issue: #42791)
Track Shard-Snapshot Index Generation at Repository Root #46250 (issues: #38941, #45736)

Store

mmap dim files in HybridDirectory #49272 (issue: #48509)

Transform

Improve force stop robustness in case of an error #51072
Add actual timeout in message #50140
Automatic deletion of old checkpoints #49496
Improve error handling of script errors #48887 (issue: #48467)
Add wait_for_checkpoint flag to stop #47935 (issue: #45293)

Bug fixes

Aggregations

Use #name() instead of #simpleName() when generating doc values #51920 (issues: #50307, #51847)
Fix a sneaky bug in rare_terms #51868 (issue: #51020)
Support time_zone on composite’s date_histogram #51172 (issues: #45199, #45200)
Fix format problem in composite of unmapped #50869 (issue: #50600)
SingleBucket aggs need to reduce their bucket’s pipelines first #50103 (issue: #50054)
Avoid precision loss in DocValueFormat.RAW#parseLong #49063 (issue: #38692)
Fix ignoring missing values in min/max aggregations #48970 (issue: #48905)

Allocation

Collect shard sizes for closed indices #50645 (issue: #33888)
Auto-expand replicated closed indices #48973
Ignore dangling indices created in newer versions #48652 (issue: #34264)
Handle negative free disk space in deciders #48392 (issue: #48380)

Analysis

Fix caching for PreConfiguredTokenFilter #50912 (issue: #50734)
Throw Error on deprecated nGram and edgeNGram custom filters #50376 (issue: #50360)
_analyze api does not correctly use normalizers when specified #48866 (issue: #48650)

Audit

Audit log filter and marker #45456 (issue: #47251)

Authentication

Preserve ApiKey credentials for async verification #51244
Don’t fallback to anonymous for tokens/apikeys #51042 (issue: #50171)
Populate User metadata with OpenIDConnect collections #50521 (issue: #50250)
Always return 401 for not valid tokens #49736 (issue: #38866)
Fix iterate-from-1 bug in smart realm order #49473
Remove unnecessary details logged for OIDC #48746
Add owner flag parameter to the rest spec #48500 (issue: #48499)

Authorization

Fix memory leak in DLS bitset cache #50635 (issue: #49261)
Validate field permissions when creating a role #50212 (issues: #46275, #48108)
Validate field permissions when creating a role #48108 (issue: #46275)

CCR

CCR should auto-retry rejected execution exceptions #49213

CRUD

Block too many concurrent mapping updates #51038 (issue: #50670)
Ensure meta and document field maps are never null in GetResult #50112 (issue: #48215)
Replicate write actions before fsyncing them #49746
Do not mutate request on scripted upsert #49578 (issue: #48670)
Fix Transport Stopped Exception #48930 (issue: #42612)
Return consistent source in updates #48707
Close query cache on index service creation failure #48230 (issue: #48186)

Cluster Coordination

Import replicated closed dangling indices #50649
Ignore metadata of deleted indices at start #48918
Make elasticsearch-node tools custom metadata-aware #48390

Discovery-Plugins

Make EC2 Discovery Cache Empty Seed Hosts List #50607 (issue: #50550)
Make EC2 Discovery Plugin Retry Requests #50550 (issue: #50462)

Distributed

Exclude nested documents in LuceneChangesSnapshot #51279
Closed shard should never open new engine #47186 (issues: #45263, #47060)
Fix meta version of task index mapping #50363 (issue: #48393)

Engine

Do not wrap soft-deletes reader for segment stats #51331 (issues: #51192, #51303)
Account soft-deletes in FrozenEngine #51192 (issue: #50775)
Account trimAboveSeqNo in committed translog generation #50205 (issue: #49970)
Greedily advance safe commit on new global checkpoint #48559 (issue: #48532)
Do not ignore exception when trim unreferenced readers #48470

Features/Features

Fix X-Pack SchedulerEngine Shutdown #48951

Features/ILM+SLM

Fix SLM check for restore in progress #50868
Handle failure to retrieve ILM policy step better #49193 (issue: #49128)
Don’t halt policy execution on policy trigger exception #49128
Re-read policy phase JSON when using ILM’s move-to-step API #48827
Don’t schedule SLM jobs when services have been stopped #48658 (issue: #47749)
Ensure SLM stats does not block an in-place upgrade from 7.4 #48367
Ensure SLM stats does not block an in-place upgrade from 7.4 #48361
Add SLM support to xpack usage and info APIs #48096 (issue: #43663)
Change policy_id to list type in slm.get_lifecycle #47766 (issue: #47765)

Features/Ingest

Fix ignore_missing in CsvProcessor #51600
Don’t overwrite target field with SetSecurityUserProcessor #51454 (issue: #51428)
Fix ingest simulate response document order if processor executes async #50244
Allow list of IPs in geoip ingest processor #49573 (issue: #46193)
Do not wrap ingest processor exception with IAE #48816 (issue: #48810)
Introduce dedicated ingest processor exception #48810 (issue: #48803)

Features/Java High Level REST Client

Support es7 node http publish_address format #49279 (issue: #48950)
Add slices to delete and update by query in HLRC #48420
fix incorrect comparison #48208
Fix HLRC parsing of CancelTasks response #47017
Prevent deadlock by using separate schedulers #48697 (issues: #41451, #47599)

Features/Java Low Level REST Client

Improve warning value extraction performance in Response #50208 (issue: #24114)

Features/Monitoring

Validate exporter type is HTTP for HTTP exporter #49992 (issues: #47246, #47711, #49942)
APM system_user #47668 (issues: #2708, #40876)

Geo

Guard against null geoBoundingBox #50506 (issue: #50505)
Geo: Switch generated GeoJson type names to camel case (#50285) #50400 (issue: #49568)
Geo: Switch generated WKT to upper case #50285 (issue: #49568)
Fix typo when assigning null_value in GeoPointFieldMapper #49645
Fix handling of circles in legacy geo_shape queries #49410 (issue: #49296)
GEO: intersects search for geo_shape return wrong result #49017
Geo: improve handling of out of bounds points in linestrings #47939 (issue: #43916)

Highlighting

Fix invalid break iterator highlighting on keyword field #49566

Infra/Core

Ignore virtual ethernet devices that disappear #51581 (issue: #49914)
Guess root cause support unwrap #50525 (issue: #50417)
Allow parsing timezone without fully provided time #50178 (issue: #49351)
[Java.time] Retain prefixed date pattern in formatter #48703 (issue: #48698)
Don’t drop user’s MaxDirectMemorySize flag on jdk8/windows #48657 (issues: #44174, #48365)
Warn when MaxDirectMemorySize may be incorrect (Windows/JDK8 only issue) #48365 (issue: #47384)
[Java.time] Calculate week of a year with ISO rules #48209 (issues: #41670, #42588, #43275, #43652)

Infra/Logging

Slow log must use separate underlying logger for each index #47234 (issue: #42432)

Infra/Packaging

Extend systemd timeout during startup #49784 (issue: #49593)

Infra/REST API

Return 400 when handling invalid JSON #49552 (issue: #49428)
Slash missed in indices.put_mapping url #49468

Machine Learning

Fix 2 digit year regex in find_file_structure #51469
Validate classification dependent_variable cardinality is at least two #51232
Do not copy mapping from dependent variable to prediction field in regression analysis #51227
Handle nested and aliased fields correctly when copying mapping #50918 (issue: #50787)
Fix off-by-one error in ml_classic tokenizer end offset #50655
Improve uniqueness of result document IDs #50644 (issue: #50613)
Fix accuracy metric in multi-class confusion matrix #50310 (issue: #48759)
Fix race condition when stopping a data frame analytics jobs immediately after starting it #50276 (issues: #49680, #50177)
Apply source query on data frame analytics memory estimation #49517 (issue: #49454)
Fix r_squared eval when variance is 0 #49439
Blacklist a number of prediction field names #49371 (issue: #48808)
Make data frame analytics more robust for very short-lived analyses #49282 (issue: #49095)
Fixes potential memory corruption when determining seasonality #852
Prevent prediction_field_name clashing with other fields in machine learning results #861
Include out-of-order as well as in-order terms in categorization reverse searches #950 (issue: #949)

Mapping

Ensure that field collapsing works with field aliases. #50722 (issues: #32648, #50121)
Improve DateFieldMapper ignore_malformed handling #50090 (issues: #46675, #50081)
Annotated text type should extend TextFieldType #49555 (issue: #49289)
Ensure parameters are updated when merging flattened mappings. #48971 (issue: #48907)

Network

Fix TransportMasterNodeAction not Retrying NodeClosedException #51325

Percolator

Correctly handle MSM for nested disjunctions #50669 (issue: #50305)
Fix query analyzer logic for mixed conjunctions of terms and ranges #49803 (issue: #49684)

Recovery

Check allocation id when failing shard on recovery #50656 (issue: #50508)
Migrate peer recovery from translog to retention lease #49448 (issue: #45136)
Ignore Lucene index in peer recovery if translog corrupted #49114

Reindex

Reindex and friends fail on RED shards #45830 (issues: #42612, #45739)

SQL

SQL: Fix milliseconds handling in intervals #51675 (issue: #41635)
SQL: Fix ORDER BY YEAR() function #51562 (issue: #51224)
SQL: change the way unsupported data types fields are handled #50823
SQL: Optimisation fixes for conjunction merges #50703 (issue: #49637)
SQL: Fix issue with CAST and NULL checking. #50371 (issue: #50191)
SQL: fix NPE for JdbcResultSet.getDate(param, Calendar) calls #50184 (issue: #50174)
SQL: COUNT DISTINCT returns 0 instead of NULL for no matching docs #50037 (issue: #50013)
Fix LOCATE function optional parameter handling #49666 (issue: #49557)
Fix NULL handling for FLOOR and CEIL functions #49644 (issue: #49556)
Handle NULL arithmetic operations with INTERVALs #49633 (issue: #49297)
Fix issue with GROUP BY YEAR() #49559 (issue: #49386)
Fix issue with CASE/IIF pre-calculating results #49553 (issue: #49388)
Fix issue with folding of CASE/IIF #49449 (issue: #49387)
Fix issues with WEEK/ISO_WEEK/DATEDIFF #49405 (issues: #48209, #49376)
SQL: Fix issue with mins & hours for DATEDIFF #49252
SQL: Failing Group By queries due to different ExpressionIds #43072 (issues: #33361, #34543, #36074, #37044, #40001, #40240, #41159, #42041, #46316)

Search

Fix upgrade of custom similarity #50851 (issue: #50763)
Fix NPE bug inner_hits #50709 (issue: #50539)
Collect results in a local list when notifying partial results #49828 (issue: #49778)
Fixes a bug in interval filter serialization #49793 (issue: #49519)
Correctly handle duplicates in unordered interval matching #49775
Correct rewritting of script_score query #48425 (issue: #48081)
Do not throw errors on unknown types in SearchAfterBuilder #48147 (issue: #48074)

Security

Always consume the body in has privileges #50298 (issue: #50288)

Snapshot/Restore

Fix Overly Aggressive Request DeDuplication #51270 (issue: #51253)
Guard Repository#getRepositoryData for exception throw #50970
Fix Index Deletion During Partial Snapshot Create #50234 (issues: #50200, #50202)
Fix Index Deletion during Snapshot Finalization #50202 (issues: #45689, #50200)
Fix RepoCleanup not Removed on Master-Failover #49217
Make FsBlobContainer Listing Resilient to Concurrent Modifications #49142 (issue: #37581)
Fix SnapshotShardStatus Reporting for Failed Shard #48556 (issue: #48526)
Cleanup Concurrent RepositoryData Loading #48329 (issue: #48122)

Transform

Fix mapping deduction for scaled_float #51990 (issue: #51780)
Fix stats can return old state information if security is enabled #51732 (issue: #51728)
Fail to start/put on missing pipeline #50701 (issue: #50135)
Fix possible audit logging disappearance after rolling upgrade #49731 (issue: #49730)
Do not fail checkpoint creation due to global checkpoint mismatch #48423 (issue: #48379)

Upgrades

Engine

Upgrade to Lucene 8.4.0. #50518

Infra/Packaging

Upgrade the bundled JDK to JDK 13.0.2 #51511

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