Elasticsearch version 8.0.0-rc2
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.
Deprecations
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Engine
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Deprecate setting
max_merge_at_once_explicit #80574
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Search
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Configure
IndexSearcher.maxClauseCount() based on node characteristics #81525 (issue: #46433)
New features
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Snapshot/Restore
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Support IAM roles for Kubernetes service accounts #81255 (issue: #52625)
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Watcher
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Use
startsWith rather than exact matches for Watcher history template names #82396
Enhancements
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Cluster Coordination
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ILM+SLM
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Avoid unnecessary
LifecycleExecutionState recalculation #81558 (issues: #77466, #79692)
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Make unchanged ILM policy updates into no-op #82240 (issue: #82065)
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Infra/Core
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Prevent upgrades to 8.0 without first upgrading to the last 7.x release #82321 (issue: #81865)
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Machine Learning
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Add
deployment_stats to trained model stats #80531
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The setting
use_auto_machine_memory_percent now defaults to max_model_memory_limit #80532 (issue: #80415)
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Network
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Improve slow inbound handling to include response type #80425
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Packaging
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Convert repository plugins to modules #81870 (issue: #81652)
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Search
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Check nested fields earlier in kNN search #80516 (issue: #78473)
Bug fixes
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Autoscaling
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Use adjusted total memory instead of total memory #80528 (issue: #78750)
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Infra/Scripting
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Fix duplicated allow lists upon script engine creation #82820 (issue: #82778)
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Ingest
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Adjust default geoip logging to be less verbose #81404 (issue: #81356)
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Machine Learning
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Check that
total_definition_length is consistent before starting a deployment #80553
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Fail inference processor more consistently on certain error types #81475
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Optimize the job stats call to do fewer searches #82362 (issue: #82255)
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Recovery
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Make shard started response handling only return after the cluster state update completes #82790 (issue: #81628)
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Search
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Reject zero-length vectors when using cosine similarity #82241 (issue: #81167)
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Security
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Auto-generated TLS files under fixed config path #81547 (issue: #81057)
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Bind to non-localhost for transport in some cases #82973
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Correct file ownership on node reconfiguration #82789 (issue: #80990)
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Display security auto-configuration with fancy unicode #82740 (issue: #82364)
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Snapshot/Restore
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Upgrades
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Infra/Logging
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Upgrade ECS logging layout to latest version #80500
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Search
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Upgrade to released lucene 9.0.0 #81426