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Elasticsearch version 8.0.0-rc2

Also see Breaking changes in 8.0.

Known issues

Do not upgrade production clusters to Elasticsearch 8.0.0-rc2. Elasticsearch 8.0.0-rc2 is a pre-release of Elasticsearch 8.0 and is intended for testing purposes only.

Upgrades from pre-release builds are not supported and could result in errors or data loss. If you upgrade from a released version, such as 7.16, to a pre-release version for testing, discard the contents of the cluster when you are done. Do not attempt to upgrade to the final 8.0 release.
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
```
Deprecations

Engine
Deprecate setting max_merge_at_once_explicit #80574

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

New features

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

Cluster Coordination

Make TaskBatcher less lock-heavy #82227 (issue: #77466)

ILM+SLM

Avoid unnecessary LifecycleExecutionState recalculation #81558 (issues: #77466, #79692)
Make unchanged ILM policy updates into no-op #82240 (issue: #82065)

Infra/Core

Prevent upgrades to 8.0 without first upgrading to the last 7.x release #82321 (issue: #81865)

Machine Learning

Add deployment_stats to trained model stats #80531
The setting use_auto_machine_memory_percent now defaults to max_model_memory_limit #80532 (issue: #80415)

Network

Improve slow inbound handling to include response type #80425

Packaging

Convert repository plugins to modules #81870 (issue: #81652)

Search

Check nested fields earlier in kNN search #80516 (issue: #78473)

Bug fixes

Autoscaling

Use adjusted total memory instead of total memory #80528 (issue: #78750)

Infra/Scripting

Fix duplicated allow lists upon script engine creation #82820 (issue: #82778)

Ingest

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

Machine Learning

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)

Recovery

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

Search

Reject zero-length vectors when using cosine similarity #82241 (issue: #81167)

Security

Auto-generated TLS files under fixed config path #81547 (issue: #81057)
Bind to non-localhost for transport in some cases #82973
Correct file ownership on node reconfiguration #82789 (issue: #80990)
Display security auto-configuration with fancy unicode #82740 (issue: #82364)

Snapshot/Restore

Remove custom metadata if there is nothing to restore #81373 (issues: #81247, #82019)

Upgrades

Infra/Logging

Upgrade ECS logging layout to latest version #80500

Search

Upgrade to released lucene 9.0.0 #81426

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.0.0-rc2.html

Elasticsearch version 8.0.0-rc2

Known issues

Deprecations

New features

Enhancements

Bug fixes

Upgrades