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Elasticsearch version 8.0.0

The following list are changes in 8.0.0 as compared to 7.17.0, and combines release notes from the 8.0.0-alpha1, -alpha2, -beta1, -rc1 and -rc2 releases.

Also see Breaking changes in 8.0.

Known issues

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If you installed Elasticsearch from an archive on an aarch64 platform like Linux ARM or macOS M1, the elastic user password and Kibana enrollment token are not generated automatically when starting your node for the first time.

After the node starts, generate the elastic password with the bin/elasticsearch-reset-password tool:
```
bin/elasticsearch-reset-password -u elastic
```
Then, create an enrollment token for Kibana with the bin/elasticsearch-create-enrollment-token tool:
```
bin/elasticsearch-create-enrollment-token -s kibana
```
Parsing a request when the last element in an array is filtered out (for instance using _source_includes) fails. This is due to a bug in Jackson parser. Fixed in Elasticsearch 8.6.1 (#91456)

Breaking changes

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Aggregations

Percentiles aggregation: disallow specifying same percentile values twice #52257 (issue: #51871)
Remove adjacency matrix setting #46327 (issues: #46257, #46324)
Remove MovingAverage pipeline aggregation #39328
Remove deprecated _time and _term sort orders #39450
Remove deprecated date histo interval #75000

Allocation

Require single data nodes to respect disk watermarks #73737 (issues: #55805, #73733)
Remove include_relocations setting #47717 (issues: #46079, #47443)

Analysis

Cleanup versioned deprecations in analysis #41560 (issue: #41164)
Remove preconfigured delimited_payload_filter #43686 (issues: #41560, #43684)

Authentication

Always add file and native realms unless explicitly disabled #69096 (issue: #50892)
Do not set a NameID format in Policy by default #44090 (issue: #40353)
Make order setting mandatory for Realm config #51195 (issue: #37614)

CCR

Avoid auto following leader system indices in CCR #72815 (issue: #67686)

Cluster Coordination

Remove join timeout #60873 (issue: #60872)
Remove node filters for voting config exclusions #55673 (issues: #47990, #50836)
Remove support for delaying state recovery pending master #53845 (issue: #51806)

Distributed

Remove synced flush #50882 (issues: #50776, #50835)
Remove the cluster.remote.connect setting #54175 (issue: #53924)

Engine

Force merge should reject requests with only_expunge_deletes and max_num_segments set #44761 (issue: #43102)
Remove per-type indexing stats #47203 (issue: #41059)
Remove translog retention settings #51697 (issue: #50775)

Features/CAT APIs

Remove the deprecated local parameter for _cat/indices #64868 (issue: #62198)
Remove the deprecated local parameter for _cat/shards #64867 (issue: #62197)

Features/Features

Remove deprecated ._tier allocation filtering settings #73074 (issue: #72835)

Features/ILM+SLM

Add lower bound on poll_interval #39593 (issue: #39163)
Make the ILM freeze action a no-op #77158 (issue: #70192)
Always enforce default tier preference #79751 (issue: #76147)
Validate that snapshot repository exists for ILM policies at creation/update time #78468 (issues: #72957, #77657)
Default cluster.routing.allocation.enforce_default_tier_preference to true #79275 (issues: #76147, #79210)

Features/Indices APIs

Change prefer_v2_templates parameter to default to true #55489 (issues: #53101, #55411)
Remove deprecated _upgrade API #64732 (issue: #21337)
Remove local parameter for get field mapping request #55100 (issue: #55099)
Remove include_type_name parameter from REST layer #48632 (issue: #41059)
Remove the template field in index templates #49460 (issue: #21009)
Remove endpoint for freezing indices #78918 (issues: #70192, #77273)

Features/Watcher

Move watcher history to data stream #64252

Geo

Disallow creating geo_shape mappings with deprecated parameters #70850 (issue: #32039)
Remove bounding box query type parameter #74536

Infra/Circuit Breakers

Fixed synchronizing inflight breaker with internal variable #40878

Infra/Core

Limit processors by available processors #44894 (issue: #44889)
Remove nodes/0 folder prefix from data path #42489
Remove bootstrap.system_call_filter setting #72848
Remove fixed_auto_queue_size threadpool type #52280
Remove node.max_local_storage_nodes #42428 (issue: #42426)
Remove camel case named date/time formats #60044
Remove legacy role settings #71163 (issues: #54998, #66409, #71143)
Remove processors setting #45905 (issue: #45855)
Remove the local parameter of /_cat/nodes #50594 (issues: #50088, #50499)
Remove the listener thread pool #53314 (issue: #53049)
Remove the node local storage setting #54381 (issue: #54374)
Remove the pidfile setting #45940 (issue: #45938)
Removes week_year date format #63384 (issue: #60707)
System indices treated as restricted indices #74212 (issue: #69298)
Remove Joda dependency #79007
Remove Joda support from date formatters #78990
All system indices are hidden indices #79512

Infra/Logging

Remove slowlog level #57591 (issue: #56171)

Infra/Plugins

Remove deprecated basic license feature enablement settings #56211 (issue: #54745)

Infra/REST API

Remove content type required setting #61043
Remove deprecated endpoints containing _xpack #48170 (issue: #35958)
Remove deprecated endpoints of hot threads API #55109 (issue: #52640)
Allow parsing Content-Type and Accept headers with version #61427

Infra/Resiliency

Fail node containing ancient closed index #44264 (issues: #21830, #41731, #44230)

Infra/Scripting

Consolidate script parsing from object #59507 (issue: #59391)
Move script_cache into _nodes/stats #59265 (issues: #50152, #59262)
Remove general cache settings #59262 (issue: #50152)

Infra/Settings

Change default value of action.destructive_requires_name to true #66908 (issue: #61074)
Forbid settings without a namespace #45947 (issues: #45905, #45940)

Ingest

Remove default maxmind GeoIP databases from distribution #78362 (issue: #68920)

License

Set xpack.security.enabled to true for all licenses #72300
Enforce license expiration #79671

Machine Learning

Remove deprecated _xpack endpoints #59870 (issues: #35958, #48170)
Remove the ability to update datafeed’s job_id #44752 (issue: #44616)
Remove allow_no_datafeeds and allow_no_jobs parameters from APIs #80048 (issue: #60732)

Mapping

Remove boost mapping parameter #62639 (issue: #62623)
Remove support for chained multi-fields #42333 (issues: #41267, #41926)
Remove support for string in unmapped_type #45675
Removes typed URLs from mapping APIs #41676

Network

Remove client feature tracking #44929 (issues: #31020, #42538, #44667)
Remove escape hatch permitting incompatible builds #65753 (issues: #65249, #65601)

Packaging

Remove SysV init support #51716 (issue: #51480)
Remove support for JAVA_HOME #69149 (issue: #55820)
Remove no-jdk distributions #76896 (issue: #65109)
Require Java 17 for running Elasticsearch #79873

Recovery

Remove dangling index auto import functionality #59698 (issue: #48366)

Reindex

Reindex from Remote encoding #41007 (issue: #40303)
Reindex remove outer level size #43373 (issues: #24344, #41894)

Rollup

RollupStart endpoint should return OK if job already started #41502 (issues: #35928, #39845)

Search

Decouple shard allocation awareness from search and get requests #45735 (issue: #43453)
Fix range query on date fields for number inputs #63692 (issue: #63680)
Make fuzziness reject illegal values earlier #33511
Make remote cluster resolution stricter #40419 (issue: #37863)
Parse empty first line in msearch request body as action metadata #41011 (issue: #39841)
Remove CommonTermsQuery and cutoff_frequency param #42654 (issue: #37096)
Remove type query #47207 (issue: #41059)
Remove use_field_mapping format option for docvalue fields #55622
Remove deprecated SimpleQueryStringBuilder parameters #57200
Remove deprecated search.remote settings #42381 (issues: #33413, #38556)
Remove deprecated sort options: nested_path and nested_filter #42809 (issue: #27098)
Remove deprecated vector functions #48725 (issue: #48604)
Remove support for _type in searches #68564 (issues: #41059, #68311)
Remove support for sparse vectors #48781 (issue: #48368)
Remove the object format for indices_boost #55078
Removes type from TermVectors APIs #42198 (issue: #41059)
Removes typed endpoint from search and related APIs #41640
Set max allowed size for stored async response #74455 (issue: #67594)
indices.query.bool.max_clause_count now limits all query clauses #75297

Security

Remove obsolete security settings #40496
Remove support of creating CA on the fly when generating certificates #65590 (issue: #61884)
Remove the id field from the InvalidateApiKey API #66671 (issue: #66317)
Remove the migrate tool #42174
Compress audit logs #64472 (issue: #63843)
Remove insecure settings #46147 (issue: #45947)
Remove kibana_dashboard_only_user reserved role #76507

Snapshot/Restore

Blob store compress default to true #40033
Get snapshots support for multiple repositories #42090 (issue: #41210)
Remove repository stats API #62309 (issue: #62297)
Remove frozen cache setting leniency #71013 (issue: #70341)
Adjust snapshot index resolution behavior to be more intuitive #79670 (issue: #78320)

TLS

Reject misconfigured/ambiguous SSL server config #45892
Remove support for configurable PKCS#11 keystores #75404
Remove the client transport profile filter #43236

Breaking Java changes

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Authentication

Mandate x-pack REST handler installed #71061 (issue: #70523)

CCR

Remove the CcrClient #42816

CRUD

Remove types from BulkRequest #46983 (issue: #41059)
Remove Client.prepareIndex(index, type, id) method #48443

Client

Remove SecurityClient from x-pack #42471

Features/ILM+SLM

Remove the ILMClient #42817

Features/Monitoring

Remove MonitoringClient from x-pack #42770

Features/Watcher

Remove WatcherClient from x-pack #42815

Infra/Core

Remove XPackClient from x-pack #42729
Remove the transport client #42538
Remove transport client from x-pack #42202

Infra/REST API

Copy HTTP headers to ThreadContext strictly #45945

Machine Learning

Remove the MachineLearningClient #43108

Mapping

Remove type filter from GetMappings API #47364 (issue: #41059)
Remove type parameter from PutMappingRequest.buildFromSimplifiedDef() #50844 (issue: #41059)
Remove unused parameter from MetadataFieldMapper.TypeParser#getDefault() #51219
Remove type parameter from CIR.mapping(type, object...) #50739 (issue: #41059)

Search

Removes types from SearchRequest and QueryShardContext #42112

Snapshot/Restore

Remove deprecated repository methods #42359 (issue: #42213)

Deprecations

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Authentication

Deprecate setup-passwords tool #76902

CRUD

Remove indices_segments verbose parameter #78451 (issue: #75955)

Engine

Deprecate setting max_merge_at_once_explicit #80574

Machine Learning

Deprecate estimated_heap_memory_usage_bytes and replace with model_size_bytes #80554

Monitoring

Add deprecation info API entries for deprecated monitoring settings #78799
Automatically install monitoring templates at plugin initialization #78350
Remove Monitoring ingest pipelines #77459 (issue: #50770)

Search

Configure IndexSearcher.maxClauseCount() based on node characteristics #81525 (issue: #46433)

Transform

Improve transform deprecation messages #81847 (issues: #81521, #81523)

New features

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Security

Auto-configure TLS for new nodes of new clusters #77231 (issues: #75144, #75704)

Snapshot/Restore

Support IAM roles for Kubernetes service accounts #81255 (issue: #52625)

Watcher

Use startsWith rather than exact matches for Watcher history template names #82396

Enhancements

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Analysis

Move reload_analyzers endpoint to x-pack #43559

Authentication

Reset elastic password CLI tool #74892 (issues: #70113, #74890)
Autogenerate and print elastic password on startup #77291
Enroll Kibana API uses Service Accounts #76370
Add reset-kibana-system-user tool #77322
New CLI tool to reset password for built-in users #79709
Auto-configure the elastic user password #78306

Authorization

Granting kibana_system reserved role access to "all" privileges to .internal.preview.alerts* index #80889 (issues: #76624, #80746, #116374)
Granting kibana_system reserved role access to "all" privileges to .preview.alerts* index #80746
Granting editor and viewer roles access to alerts-as-data indices #81285

Cluster Coordination

Prevent downgrades from 8.x to 7.x #78586 (issues: #42489, #52414)
Prevent downgrades from 8.x to 7.x #78638 (issues: #42489, #52414)
Make TaskBatcher less lock-heavy #82227 (issue: #77466)

Data streams

Data stream support read and write with custom routing and partition size #74394 (issue: #74390)

EQL

Add option for returning results from the tail of the stream #64869 (issue: #58646)
Introduce case insensitive variant in~ #68176 (issue: #68172)
Optimize redundant toString #71070 (issue: #70681)

Engine

Always use soft-deletes in InternalEngine #50415
Remove translog retention policy #51417 (issue: #50775)

Features/CAT APIs

Remove size and add time params to _cat/threadpool #55736 (issue: #54478)

Features/ILM+SLM

Allow for setting the total shards per node in the Allocate ILM action #76794 (issue: #76775)
Inject migrate action regardless of allocate action #79090 (issue: #76147)
Make unchanged ILM policy updates into noop #82240 (issue: #82065)
Avoid unnecessary LifecycleExecutionState recalculation #81558 (issues: #77466, #79692)

Features/Indices APIs

Batch rollover cluster state updates #79945 (issues: #77466, #79782)
Reuse MappingMetadata instances in Metadata class #80348 (issues: #69772, #77466)

Features/Stats

Add bulk stats track the bulk per shard #52208 (issues: #47345, #50536)

Features/Watcher

Remove Watcher history clean up from monitoring #67154

Infra/Core

Remove aliases exist action #43430
Remove indices exists action #43164
Remove types exists action #43344
Retain reference to stdout for exceptional cases #77460
Check whether stdout is a real console #79882
Share int, long, float, double, and byte pages #75053
Revert "Deprecate resolution loss on date field (#78921)" #79914 (issue: #78921)
Add two missing entries to the deprecation information API #80290 (issue: #80233)
Prevent upgrades to 8.0 without first upgrading to the last 7.x release #82321 (issue: #81865)

Infra/Logging

Make Elasticsearch JSON logs ECS compliant #47105 (issue: #46119)

Infra/REST API

Allow for field declaration for future compatible versions #69774 (issue: #51816)
Introduce stability description to the REST API specification #38413
Parsing: Validate that fields are not registered twice #70243
Support response content-type with versioned media type #65500 (issue: #51816)
[REST API Compatibility] Typed endpoints for index and get APIs #69131 (issue: #54160)
[REST API Compatibility] Typed endpoints for put and get mapping and get field mappings #71721 (issues: #51816, #54160)
[REST API Compatibility] Allow copy_settings flag for resize operations #75184 (issues: #38514, #51816)
[REST API Compatibility] Allow for type in geo shape query #74553 (issues: #51816, #54160)
[REST API Compatibility] Always return adjust_pure_negative value #75182 (issues: #49543, #51816)
[REST API Compatibility] Clean up x-pack/plugin rest compat tests #74701 (issue: #51816)
[REST API Compatibility] Do not return _doc for empty mappings in template #75448 (issues: #51816, #54160, #70966, #74544)
[REST API Compatibility] Dummy REST action for indices.upgrade API #75136 (issue: #51816)
[REST API Compatibility] REST Terms vector typed response #73117
[REST API Compatibility] Rename BulkItemResponse.Failure type field #74937 (issue: #51816)
[REST API Compatibility] Type metadata for docs used in simulate request #74222 (issues: #51816, #54160)
[REST API Compatibility] Typed TermLookups #74544 (issues: #46943, #51816, #54160)
[REST API Compatibility] Typed and x-pack graph explore API #74185 (issues: #46935, #51816, #54160)
[REST API Compatibility] Typed endpoint for bulk API #73571 (issue: #51816)
[REST API Compatibility] Typed endpoint for multi-get API #73878 (issue: #51816)
[REST API Compatibility] Typed endpoints for RestUpdateAction and RestDeleteAction #73115 (issues: #51816, #54160)
[REST API Compatibility] Typed endpoints for get_source API #73957 (issues: #46587, #46931, #51816)
[REST API Compatibility] Typed endpoints for explain API #73901 (issue: #51816)
[REST API Compatibility] Typed endpoints for search _count API #73958 (issues: #42112, #51816)
[REST API Compatibility] Typed indexing stats #74181 (issues: #47203, #51816, #54160)
[REST API Compatibility] Types for percolate query API #74698 (issues: #46985, #51816, #54160, #74689)
[REST API Compatibility] Validate query typed API #74171 (issues: #46927, #51816, #54160)
[REST API Compatibility] Voting config exclusion exception message #75406 (issues: #51816, #55291)
[REST API Compatibility] MoreLikeThisQuery with types #75123 (issues: #42198, #51816, #54160)
[REST API Compatibility] Update and delete by query using size field #69606
[REST API Compatibility] Indicies boost in object format #74422 (issues: #51816, #55078)
[REST API Compatibility] Typed endpoints for search and related endpoints #72155 (issues: #51816, #54160)
[REST API Compatibility] Allow to use size -1 #75342 (issues: #51816, #69548, #70209)
[REST API Compatibility] Ignore use_field_mapping option for docvalue #74435 (issue: #55622)
[REST API Compatibility] _time and _term sort orders #74919 (issues: #39450, #51816)
[REST API Compatability] template parameter and field on PUT index template #71238 (issues: #49460, #51816, #68905)
[REST API Compatibility] Make query registration easier #75722 (issue: #51816)
[REST API Compatibility] Typed query #75453 (issues: #47207, #51816, #54160)
[REST API Compatibility] Deprecate the use of synced flush #75372 (issues: #50882, #51816)
[REST API Compatibility] Licence accept_enterprise and response changes #75479 (issues: #50067, #50735, #51816, #58217)

Infra/Scripting

Update DeprecationMap to DynamicMap #56149 (issue: #52103)
Add nio Buffers to Painless #79870 (issue: #79867)
Restore the scripting general cache #79453 (issue: #62899)

Infra/Settings

Fixed inconsistent Setting.exist() #46603 (issue: #41830)
Remove index.optimize_auto_generated_id setting (#27583) #27600 (issue: #27583)
Implement setting deduplication via string interning #80493 (issues: #77466, #78892)

Ingest

Add support for _meta field to ingest pipelines #76381
Remove binary field after attachment processor execution #79172
Improving cache lookup to reduce recomputing / searches #77259
Extract more standard metadata from binary files #78754 (issue: #22339)

License

Add deprecated accept_enterprise param to /_xpack #58220 (issue: #58217)
Support accept_enterprise param in get license API #50067 (issue: #49474)
Enforce Transport TLS check on all licenses #79602 (issue: #75292)

Machine Learning

The Windows build platform for the machine learning C++ code now uses Visual Studio 2019 #1352
The macOS build platform for the machine learning C++ code is now Mojave running Xcode 11.3.1, or Ubuntu 20.04 running clang 8 for cross compilation #1429
Add a new application for evaluating PyTorch models. The app depends on LibTorch - the C++ front end to PyTorch - and performs inference on models stored in the TorchScript format #1902
Adding new PUT trained model vocabulary endpoint #77387
Creating new PUT model definition part API #76987
Add inference time configuration overrides #78441 (issue: #77799)
Optimize source extraction for categorize_text aggregation #79099
The Linux build platform for the machine learning C++ code is now CentOS 7 running gcc 10.3. #2028
Make ML indices hidden when the node becomes master #77416 (issue: #53674)
Add deployment_stats to trained model stats #80531
The setting use_auto_machine_memory_percent now defaults max_model_memory_limit #80532 (issue: #80415)

Mapping

Sparse vector to throw exception consistently #62646
Add support for configuring HNSW parameters #79193 (issue: #78473)
Extend dense_vector to support indexing vectors #78491 (issue: #78473)

Monitoring

Add previously removed Monitoring settings back for 8.0 #78784
Change Monitoring plugin cluster alerts to not install by default #79657
Adding default templates for Metricbeat ECS data #81744

Network

Enable LZ4 transport compression by default #76326 (issue: #73497)
Improve slow inbound handling to include response type #80425

Packaging

Make the Docker build more re-usable in Cloud #50277 (issues: #46166, #49926)
Update docker-compose.yml to fix bootstrap check error #47650
Allow total memory to be overridden #78750 (issue: #65905)
Convert repository plugins to modules #81870 (issue: #81652)

Recovery

Use Lucene index in peer recovery and resync #51189 (issue: #50775)
Fix PendingReplicationActions submitting lots of NOOP tasks to GENERIC #82092 (issues: #77466, #79837)

Reindex

Make reindexing managed by a persistent task #43382 (issue: #42612)
Reindex restart from checkpoint #46055 (issue: #42612)
Reindex search resiliency #45497 (issues: #42612, #43187)
Reindex v2 rethrottle sliced fix #46967 (issues: #42612, #46763)
Do not scroll if max docs is less than scroll size (update/delete by query) #81654 (issue: #54270)

Rollup

Adds support for date_nanos in Rollup Metric and DateHistogram Configs #59349 (issue: #44505)

SQL

Add text formatting support for multivalue #68606
Add xDBC and CLI support. QA CSV specs #68966
Export array values through result sets #69512
Improve alias resolution in sub-queries #67216 (issue: #56713)
Improve the optimization of null conditionals #71192
Push WHERE clause inside subqueries #71362
Use Java String methods for LTRIM/RTRIM #57594
QL: Make canonical form take into account children #71266
QL: Polish optimizer expression rule declaration #71396
QL: Propagate nullability constraints across conjunctions #71187 (issue: #70683)

Search

Completely disallow setting negative size in search #70209 (issue: #69548)
Make 0 as invalid value for min_children in has_child query #41347
Return error when remote indices are locally resolved #74556 (issue: #26247)
[REST API Compatibility] Nested path and filter sort options #76022 (issues: #42809, #51816)
[REST API Compatibility] CommonTermsQuery and cutoff_frequency parameter #75896 (issues: #42654, #51816)
[REST API Compatibility] Allow first empty line for _msearch #75886 (issues: #41011, #51816)
Node level can match action #78765
TSDB: Add time series information to field caps #78790 (issue: #74660)
Add new kNN search endpoint #79013 (issue: #78473)
Disallow kNN searches on nested vector fields #79403 (issue: #78473)
Ensure kNN search respects authorization #79693 (issue: #78473)
Load kNN vectors format with mmapfs #78724 (issue: #78473)
Support cosine similarity in kNN search #79500
Node level can match action #78765
Check nested fields earlier in kNN search #80516 (issue: #78473)

Security

Add a tool for creating enrollment tokens #74890
Add the Enroll Kibana API #72207
Change default hashing algorithm for FIPS 140 #55544
Create enrollment token #73573 (issues: #71438, #72129)
Enroll node API #72129
Configure security for the initial node CLI #74868
Generate and store password hash for elastic user #76276 (issue: #75310)
Set elastic password and generate enrollment token #75816 (issue: #75310)
Add elasticsearch-enroll-node tool #77292
Default hasher to PBKDF2_STRETCH on FIPS mode #76274
Add v7 restCompat for invalidating API key with the id field #78664 (issue: #66671)
Print enrollment token on startup #78293
Startup check for security implicit behavior change #76879
CLI tool to reconfigure nodes to enroll #79690 (issue: #7718)
Security auto-configuration for packaged installations #75144 (issue: #78306)

Snapshot/Restore

Introduce searchable snapshots index setting for cascade deletion of snapshots #74977
Unify blob store compress setting #39346 (issue: #39073)
Add recovery state tracking for searchable snapshots #60505
Allow listing older repositories #78244
Optimize SLM Policy Queries #79341 (issue: #79321)

TLS

Add ChaCha20 TLS ciphers on Java 12+ #42155
Add support for KeyStore filters to ssl-config #75407
Update TLS ciphers and protocols for JDK 11 #41808 (issues: #38646, #41385)

Transform

Prevent old beta transforms from starting #79712

TSDB

Automatically add timestamp mapper #79136
Create a coordinating node level reader for tsdb #79197
Fix TSDB shrink test in multi-version cluster #79940 (issue: #79936)
Do not allow shadowing metrics or dimensions #79757

Bug fixes

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Aggregations

Fix BWC issues for x_pack/usage #55181 (issue: #54847)
Fix DoubleBounds null serialization #59475
Fix TopHitsAggregationBuilder adding duplicate _score sort clauses #42179 (issue: #42154)
Fix t_test usage stats #54753 (issue: #54744)
Throw exception if legacy interval cannot be parsed in DateIntervalWrapper #41972 (issue: #41970)

Autoscaling

Autoscaling use adjusted total memory #80528 (issue: #78750)

CCR

Fix AutoFollow version checks #73776 (issue: #72935)

Cluster Coordination

Apply cluster states in system context #53785 (issue: #53751)

Data streams

Prohibit restoring a data stream alias with a conflicting write data stream #81217 (issue: #80976)

Distributed

Introduce ?wait_for_active_shards=index-setting #67158 (issue: #66419)
Fixes to task result index mapping #50359 (issue: #50248)

Features/CAT APIs

Fix cat recovery display of bytes fields #40379 (issue: #40335)

Features/ILM+SLM

Ensuring that the ShrinkAction does not hang if total shards per node is too low #76732 (issue: #44070)
Less verbose serialization of snapshot failure in SLM metadata #80942 (issue: #77466)

Features/Indices APIs

Fix ComposableIndexTemplate equals when composed_of is null #80864

Features/Java High Level REST Client

The Java High Level Rest Client (HLRC) has been removed and replaced by a new Elasticsearch Java client. For migration steps, refer to Migrate from the High Level Rest Client.

Geo

Preprocess polygon rings before processing it for decomposition #59501 (issues: #54441, #59386)

Infra/Core

Add searchable snapshot cache folder to NodeEnvironment #66297 (issue: #65725)
CLI tools: Write errors to stderr instead of stdout #45586 (issue: #43260)
Precompute ParsedMediaType for XContentType #67409
Prevent stack overflow in rounding #80450

Infra/Logging

Fix NPE when logging null values in JSON #53715 (issue: #46702)
Fix stats in slow logs to be a escaped JSON #44642
Populate data stream fields when xOpaqueId not provided #62156

Infra/REST API

Do not allow spaces within MediaType's parameters #64650 (issue: #51816)
Handle incorrect header values #64708 (issues: #51816, #64689)
Ignore media ranges when parsing #64721 (issues: #51816, #64689)
RestController should not consume request content #44902 (issue: #37504)
Handle exceptions thrown from RestCompatibleVersionHelper #80253 (issues: #78214, #79060)

Infra/Scripting

Change compound assignment structure to support string concatenation #61825
Fixes casting in constant folding #61508
Several minor Painless fixes #61594
Fix duplicated allow lists upon script engine creation #82820 (issue: #82778)

Infra/Settings

Stricter UpdateSettingsRequest parsing on the REST layer #79227 (issue: #29268)
Set Auto expand replica on deprecation log data stream #79226 (issue: #78991)

Ingest

Adjust default geoip logging to be less verbose #81404 (issue: #81356)

Machine Learning

Add timeout parameter for delete trained models API #79739 (issue: #77070)
Tone down ML unassigned job notifications #79578 (issue: #79270)
Use a new annotations index for future annotations #79006 (issue: #78439)
Set model state compatibility version to 8.0.0 #2139
Check that total_definition_length is consistent before starting a deployment #80553
Fail inference processor more consistently on certain error types #81475
Optimize the job stats call to do fewer searches #82362 (issue: #82255)

Mapping

Remove assertions that mappings have one top-level key #58779 (issue: #58521)

Packaging

Suppress illegal access in plugin install #41620 (issue: #41478)

Recovery

Make shard started response handling only return after the cluster state update completes #82790 (issue: #81628)

SQL

Introduce dedicated node for HAVING declaration #71279 (issue: #69758)
Make RestSqlQueryAction thread-safe #69901

Search

Check for negative from values in search request body #54953 (issue: #54897)
Fix VectorsFeatureSetUsage serialization in BWC mode #55399 (issue: #55378)
Handle total hits equal to track_total_hits #37907 (issue: #37897)
Improve error msg for CCS request on node without remote cluster role #60351 (issue: #59683)
Remove unsafe assertion in wildcard field #78966

Security

Allow access to restricted system indices for reserved system roles #76845

Snapshot/Restore

Fix GET /_snapshot/_all/_all if there are no repos #43558 (issue: #43547)
Don’t fill stack traces in SnapshotShardFailure #80009 (issue: #79718)
Remove custom metadata if there is nothing to restore #81373 (issues: #81247, #82019)

Regressions

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Search

Disable numeric sort optimization conditionally #78103

Upgrades

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Authentication

Upgrade to UnboundID LDAP SDK v6.0.2 #79332

Infra/Logging

Upgrade ECS logging layout to latest version #80500

Search

Upgrade to Lucene 9 #81426

Security

Update to OpenSAML 4 #77012 (issue: #71983)

Snapshot/Restore

Upgrade repository-hdfs plugin to Hadoop 3 #76897

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