[meta] 7.6 release

[russcam]

Preliminary release notes for 7.6.0

(Generated from asciidoc release notes on 2020-02-03)

Breaking changes

Mapping

• Add a cluster setting to disallow loading fielddata on _id field #49166 (issues: #26472 #43599)

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): PR Remove edgengram tokenizer spelling #4355

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

Infra/Core

• Deprecate the local parameter of /_cat/nodes
  #50499
  (issue:
  #50088) will be picked up by the generator

MULTIPLE AREA LABELS

• Ensure we emit a warning when using the deprecated template field.
  #50831
  (issue:
  #49460)

• Add a deprecation warning regarding allocation awareness in search
  request
  #48351
  (issue:
  #43453)

Reindex

• Deprecate sorting in reindex
  #49458
  (issue:
  #47567) PR Deprecate sort on ReindexOnServer #4357

Search

• Update the signature of vector script functions.
  #48604

• Deprecate the sparse_vector field type.
  #48315

New features

Aggregations

• New Histogram field mapper that supports percentiles aggregations.
  #48580
  (issue:
  #48578) PR Add histogram datatype #4367

• Implement stats aggregation for string terms
  #47468 PR Add StringStats aggregation #4370

Analysis

• Implement Lucene EstonianAnalyzer, Stemmer
  #49149
  (issue:
  #48895) PR Add Estonian language analyzer #4371

Features/ILM+SLM

• ILM action to wait for SLM policy execution
  #50454
  (issue:
  #45067) PR Add WaitForSnapshot ILM lifecycle action #4375

• Add ILM histore store index
  #50287
  (issue:
  #49180)

Features/Ingest

• CSV processor
  #49509
  (issue:
  #49113) PR Add Csv processor #4374

MULTIPLE AREA LABELS

• Password Protected Keystore (Feature Branch)
  #49210

Machine Learning

• Implement precision and recall metrics for classification
  evaluation
  #49671
  (issue:
  #48759)

• [ML] Explain data frame analytics API
  #49455

• [ML] ML Model Inference Ingest Processor
  #49052 draft PR Add inference processor #4412

• Implement accuracy metric for multiclass classification
  #47772
  (issue:
  #48759)

Mapping

• Add per-field metadata.
  #49419
  (issue:
  #33267) PR Add per-field metadata #4376

Search

• Add fuzzy intervals source
  #49762
  (issue:
  #49595) PR Add support for fuzzy intervals in interval query #4379

• 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) PR Support custom token chars in (edge)ngram tokenizer #4384

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) PR Add retry count and is retryable to ILM explain #4391

Features/Ingest

• Foreach processor - fork recursive call
  #50514

• Sync grok patterns with logstash patterns
  #50381

• Replace required pipeline with final pipeline
  #49470
  (issue:
  #49247) PR Add index.final_pipeline index setting #4401

• 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) PR Add preserve_trailing to Split processor #4402

• 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/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 PR Add support for bounds in geohash_grid aggregation #4403

• 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) EXPERIMENTAL API

• Scripting: fill in get contexts REST API
  #48319
  (issue:
  #47411) EXPERIMENTAL API

• Scripting: get context names REST API
  #48026
  (issue:
  #47411) EXPERIMENTAL API

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) PR Support Enterprise license type #4406

MULTIPLE AREA LABELS

• Add ingest info to Cluster Stats
  #48485
  (issue:
  #46146) PR Add ingest info to Cluster Stats response #4407

Machine Learning

• [ML] Add audit warning for 1000 categories found early in job
  #51146
  (issue:
  #50749)

• [ML] Add num_top_feature_importance_values param to regression
  and classi…
  #50914

• [ML] Implement force deleting a data frame analytics job
  #50553
  (issue:
  #48124) will be picked up by generator

• [ML] Delete unused data frame analytics state
  #50243

• Make each analysis report desired field mappings to be copied
  #50219
  (issue:
  #50119)

• [ML] retry bulk indexing of state docs
  #50149
  (issue:
  #50143)

• [ML] Persist/restore state for DFA classification
  #50040

• [ML] Introduce randomize_seed setting for regression and
  classification
  #49990

• Pass prediction_field_type to C++ analytics process
  #49861
  (issue:
  #49796)

• [ML] Add optional source filtering during data frame reindexing
  #49690
  (issue:
  #49531)

• [ML] Add default categorization analyzer definition to ML info
  #49545 PR Add categorization analyzer to defaults on ml info response #4408

• [ML] Add graceful retry for anomaly detector result indexing
  failures
  #49508
  (issue:
  #45711)

• Lower minimum model memory limit value from 1MB to 1kB.
  #49227
  (issue:
  #49168)

• Throw an exception when memory usage estimation endpoint encounters
  empty data frame.
  #49143
  (issue:
  #49140)

• Change format of MulticlassConfusionMatrix result to be more
  self-explanatory
  #48174
  (issue:
  #46735)

• Make num_top_classes parameter’s default value equal to 2
  #48119
  (issue:
  #46735)

• [ML] Improve model_memory_limit UX for data frame analytics jobs
  [ISSUE]
  #44699

Mapping

• Add telemetry for flattened fields.
  #48972 PR Add flattened usage field count #4409

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: Add TRUNC alias for TRUNCATE
  #49571
  (issue:
  #41195)

• SQL: binary communication implementation for drivers and the CLI
  #48261
  (issue:
  #47785)

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

• [Transform] Improve force stop robustness in case of an error
  #51072

• [Transform] add actual timeout in message
  #50140

• [Transform] automatic deletion of old checkpoints
  #49496

• [Transform] improve error handling of script errors
  #48887
  (issue:
  #48467)

• [ML][Transforms] add wait_for_checkpoint flag to stop
  #47935
  (issue:
  #45293)

Bug fixes

Aggregations

• 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

• 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

• 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) will be picked up by generator.

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

• Closed shard should never open new engine
  #47186
  (issues:
  #45263,
  #47060)

Engine

• 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) will be picked up by generator

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) PR Add first_only to geoip processor #4410

• 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

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)

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 [ISSUE]
  #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

MULTIPLE AREA LABELS

• Fix meta version of task index mapping
  #50363
  (issue:
  #48393)

• Prevent deadlock by using separate schedulers
  #48697
  (issues:
  #41451,
  #47599)

• APM system_user
  #47668
  (issues:
  #2708,
  #40876)

Machine Learning

• [ML] Validate classification dependent_variable cardinality is at
  lea… #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)

• [ML] Fix off-by-one error in ml_classic tokenizer end offset
  #50655

• [ML] Improve uniqueness of result document IDs
  #50644
  (issue:
  #50613)

• [7.x] Synchronize processInStream.close() call
  #50581
  (issue:
  #49680)

• Fix accuracy metric
  #50310
  (issue:
  #48759)

• Fix race condition when stopping a data frame analytics jobs
  immediately after starting it
  #50276
  (issues:
  #49680,
  #50177)

• Use query in cardinality check
  #49939

• Make only a part of stop() method a critical section.
  #49756
  (issue:
  #49680)

• Fix expired job results deletion audit message
  #49560
  (issue:
  #49549)

• [ML] Apply source query on data frame analytics memory estimation
  #49517
  (issue:
  #49454)

• Stop timing stats failure propagation
  #49495

• [ML] Fix r_squared eval when variance is 0
  #49439

• Blacklist a number of prediction field names.
  #49371
  (issue:
  #48808)

• Make AnalyticsProcessManager class more robust
  #49282
  (issue:
  #49095)

• [ML] Fixes for stop datafeed edge cases
  #49191
  (issues:
  #43670,
  #48931)

• [ML] Avoid NPE when node load is calculated on job assignment
  #49186
  (issue:
  #49150)

• Do not throw exceptions resulting from persisting datafeed timing
  stats.
  #49044
  (issue:
  #49032)

• [ML] Deduplicate multi-fields for data frame analytics
  #48799
  (issues:
  #48756,
  #48770)

• [ML] Prevent fetching multi-field from source
  #48770
  (issue:
  #48756)

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: 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

• [Transform] fail to start/put on missing pipeline
  #50701
  (issue:
  #50135)

• Fix possible audit logging disappearance after rolling upgrade
  #49731
  (issue:
  #49730)

• [Transform] 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

NOT CLASSIFIED

Aggregations

• Revert "Begin moving date_histogram to offset rounding (backport of
  #50873) (#50978)"
  #51240

Authentication

• Change password API authenticating with a bearer token [ISSUE]
  #48752

[russcam]

Closing this issue as all checklist items have been checked, and will be going into a 7.6.0 release shortly.