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Elasticsearch version 8.0.0-beta1

Also see Breaking changes in 8.0.

Known issues

If you’re using machine learning, it’s not safe to upgrade to 8.0.0-beta1 if the cluster you’re upgrading was first used prior to 7.7.0. If you attempt such an upgrade the filtered aliases against the machine learning results indices will lose their filters, causing machine learning anomaly detection results for different jobs to be mixed. Wait for 8.0.0-rc1 before attempting to test upgrading a cluster where machine learning was used prior to version 7.7.0.
System indices are included in wildcard queries when using the * pattern. Do not rely on this behavior, because system indices will be hidden in the 8.0 release. If you need to access system indices, specify the index name, use a more specific wildcard, or use the expand_wildcards parameter in your query.
By default, system indices are included in snapshots of all indices, and are restored when no indices are specified. This behavior results from including system indices in the implicit default wildcard (*) for snapshot and restore operations, which was intended for backwards compatibility in 7.x versions. In 8.0, all system indices should be accessed through the feature_states parameter of the snapshot or restore request.

Breaking changes

ILM+SLM

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 ENFORCE_DEFAULT_TIER_PREFERENCE to true #79275 (issues: #76147, #79210)

Indices APIs

Remove endpoint for freezing indices #78918 (issues: #70192, #77273)

Infra/Core

Remove Joda dependency #79007
Remove Joda support from date formatters #78990

Ingest

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

License

Enforce license expiration #79671

Machine Learning

Remove allow_no_datafeeds and allow_no_jobs parameters from APIs #80048 (issue: #60732)

Packaging

Require Java 17 for running Elasticsearch #79873

Deprecations

Authentication

Deprecate setup-passwords tool #76902

CRUD

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

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)

New features

Security

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

Enhancements

Authentication

New CLI tool to reset password for built-in users #79709
Upgrade to UnboundID LDAP SDK v6.0.2 #79332
Auto-configure the elastic user password #78306

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)

Data streams

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

ILM+SLM

Inject migrate action regardless of allocate action #79090 (issue: #76147)

Infra/Core

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)

Infra/Scripting

Add nio Buffers to Painless #79870 (issue: #79867)
Restore the scripting general cache #79453 (issue: #62899)

Ingest

Remove binary field after attachment processor execution #79172
Improving cache lookup to reduce recomputing / searches #77259

License

Enforce Transport TLS check on all licenses #79602 (issue: #75292)

Machine Learning

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)

Mapping

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

Packaging

Allow total memory to be overridden #78750 (issue: #65905)

Search

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

Security

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
Update auto-generated credentials output #79755 (issue: #79312)
CLI tool to reconfigure nodes to enroll #79690 (issue: #7718)
Security auto-configuration for packaged installations #75144 (issue: #78306)
Update to OpenSAML 4 #77012 (issue: #71983)

Snapshot/Restore

Allow listing older repositories #78244
Optimize SLM Policy Queries #79341 (issue: #79321)
Upgrade repository-hdfs plugin to Hadoop 3 #76897

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

Infra/Core

Prevent stack overflow in rounding #80450

Infra/Settings

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

Machine Learning

Add timeout parameter for delete trained models API #79739 (issue: #77070)
Fix MlMetadata backwards compatibility bug with 7.13 through 7.16 #80041
Tone down ML unassigned job notifications #79578 (issue: #79270)
Use a new annotations index for future annotations #79006 (issue: #78439)

Search

Remove unsafe assertion in wildcard field #78966

Snapshot/Restore

Don’t fill stack traces in SnapshotShardFailure #80009 (issue: #79718)

Regressions

Search

Disable numeric sort optimization conditionally #78103

Upgrades

Search

Update Lucene 9 snapshot #79701 #79138 #78548 #78286 #73324 #79461

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.0.0-beta1.html