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Elastic Docs ›Elasticsearch Guide [8.16] ›Release notes

Elasticsearch version 8.0.0-rc1

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Elasticsearch version 8.0.0-rc1

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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-rc1. Elasticsearch 8.0.0-rc1 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.

  • For Elasticsearch 8.0.0-rc1, the Elasticsearch SQL JDBC driver requires Java 17 or newer. In Elasticsearch 8.0.0-rc2, the JDBC driver will only require Java 8 or newer. https://github.com/elastic/elasticsearch/pull/82325

Breaking changes

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Infra/Core
  • All system indices are hidden indices #79512
Snapshot/Restore
  • Adjust snapshot index resolution behavior to be more intuitive #79670 (issue: #78320)

Deprecations

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Engine
  • Deprecate setting max_merge_at_once_explicit #80574
Machine Learning
  • Deprecate estimated_heap_memory_usage_bytes and replace with model_size_bytes #80554
Search
  • Configure IndexSearcher.maxClauseCount() based on node characteristics #81525 (issue: #46433)
Transform

Enhancements

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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
ILM+SLM
  • Make unchanged ILM policy updates into noop #82240 (issue: #82065)
Indices APIs
Infra/Settings
Ingest
  • Extract more standard metadata from binary files #78754 (issue: #22339)
Machine Learning
  • Add deployment_stats to trained model stats #80531
  • The setting use_auto_machine_memory_percent now defaults max_model_memory_limit #80532 (issue: #80415)
Monitoring
  • Adding default templates for Metricbeat ECS data #81744
Network
  • Improve slow inbound handling to include response type #80425
Recovery
  • Fix PendingReplicationActions submitting lots of NOOP tasks to GENERIC #82092 (issues: #77466, #79837)
Reindex
  • Do not scroll if max docs is less than scroll size (update/delete by query) #81654 (issue: #54270)
Security
  • URL option for BaseRunAsSuperuserCommand #81025 (issue: #80481)

Bug fixes

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Autoscaling
  • Autoscaling use adjusted total memory #80528 (issue: #78750)
Data streams
  • Prohibit restoring a data stream alias with a conflicting write data stream #81217 (issue: #80976)
ILM+SLM
  • Less verbose serialization of snapshot failure in SLM metadata #80942 (issue: #77466)
Indices APIs
  • Fix ComposableIndexTemplate equals when composed_of is null #80864
Infra/REST API
  • Handle exceptions thrown from RestCompatibleVersionHelper #80253 (issues: #78214, #79060)
Ingest
  • Adjust default geoip logging to be less verbose #81404 (issue: #81356)
Machine Learning
  • Set model state compatibility version to 8.0.0 #2139
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