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Elasticsearch version 8.0.0-rc2

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IMPORTANT: This documentation is no longer updated. Refer to Elastic's version policy and the latest documentation.

Elasticsearch version 8.0.0-rc2

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Also see Breaking changes in 8.0.

Known issues

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  • 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

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    Engine

  • Deprecate setting max_merge_at_once_explicit #80574

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

New features

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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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Cluster Coordination
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

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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

Upgrades

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Infra/Logging
  • Upgrade ECS logging layout to latest version #80500
Search
  • Upgrade to released lucene 9.0.0 #81426
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