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8.0.0-rc2.asciidoc

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{es} version 8.0.0-rc2

Known issues

  • Do not upgrade production clusters to {es} 8.0.0-rc2. {es} 8.0.0-rc2 is a pre-release of {es} 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 {es} from an archive on an aarch64 platform like Linux ARM or macOS M1, the elastic user password and {kib} 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 {kib} with the bin/elasticsearch-create-enrollment-token tool:

    bin/elasticsearch-create-enrollment-token -s kibana

    Deprecations

    Engine

  • Deprecate setting max_merge_at_once_explicit {es-pull}80574[#80574]

    Search

  • Configure IndexSearcher.maxClauseCount() based on node characteristics {es-pull}81525[#81525] (issue: {es-issue}46433[#46433])

New features

Snapshot/Restore

  • Support IAM roles for Kubernetes service accounts {es-pull}81255[#81255] (issue: {es-issue}52625[#52625])

Watcher

  • Use startsWith rather than exact matches for Watcher history template names {es-pull}82396[#82396]

Enhancements

Cluster Coordination

  • Make TaskBatcher less lock-heavy {es-pull}82227[#82227] (issue: {es-issue}77466[#77466])

ILM+SLM

  • Avoid unnecessary LifecycleExecutionState recalculation {es-pull}81558[#81558] (issues: {es-issue}77466[#77466], {es-issue}79692[#79692])

  • Make unchanged ILM policy updates into no-op {es-pull}82240[#82240] (issue: {es-issue}82065[#82065])

Infra/Core

  • Prevent upgrades to 8.0 without first upgrading to the last 7.x release {es-pull}82321[#82321] (issue: {es-issue}81865[#81865])

Machine Learning

  • Add deployment_stats to trained model stats {es-pull}80531[#80531]

  • The setting use_auto_machine_memory_percent now defaults to max_model_memory_limit {es-pull}80532[#80532] (issue: {es-issue}80415[#80415])

Network

  • Improve slow inbound handling to include response type {es-pull}80425[#80425]

Packaging

  • Convert repository plugins to modules {es-pull}81870[#81870] (issue: {es-issue}81652[#81652])

Search

  • Check nested fields earlier in kNN search {es-pull}80516[#80516] (issue: {es-issue}78473[#78473])

Bug fixes

Autoscaling

  • Use adjusted total memory instead of total memory {es-pull}80528[#80528] (issue: {es-issue}78750[#78750])

Infra/Scripting

  • Fix duplicated allow lists upon script engine creation {es-pull}82820[#82820] (issue: {es-issue}82778[#82778])

Ingest

  • Adjust default geoip logging to be less verbose {es-pull}81404[#81404] (issue: {es-issue}81356[#81356])

Machine Learning

  • Check that total_definition_length is consistent before starting a deployment {es-pull}80553[#80553]

  • Fail inference processor more consistently on certain error types {es-pull}81475[#81475]

  • Optimize the job stats call to do fewer searches {es-pull}82362[#82362] (issue: {es-issue}82255[#82255])

Recovery

  • Make shard started response handling only return after the cluster state update completes {es-pull}82790[#82790] (issue: {es-issue}81628[#81628])

Search

  • Reject zero-length vectors when using cosine similarity {es-pull}82241[#82241] (issue: {es-issue}81167[#81167])

Security

  • Auto-generated TLS files under fixed config path {es-pull}81547[#81547] (issue: {es-issue}81057[#81057])

  • Bind to non-localhost for transport in some cases {es-pull}82973[#82973]

  • Correct file ownership on node reconfiguration {es-pull}82789[#82789] (issue: {es-issue}80990[#80990])

  • Display security auto-configuration with fancy unicode {es-pull}82740[#82740] (issue: {es-issue}82364[#82364])

Snapshot/Restore

  • Remove custom metadata if there is nothing to restore {es-pull}81373[#81373] (issues: {es-issue}81247[#81247], {es-issue}82019[#82019])

Upgrades

Infra/Logging

  • Upgrade ECS logging layout to latest version {es-pull}80500[#80500]

Search

  • Upgrade to released lucene 9.0.0 {es-pull}81426[#81426]