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Elasticsearch version 8.0.0-rc1

Also see Breaking changes in 8.0.

Known issues

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

Infra/Core

All system indices are hidden indices #79512

Snapshot/Restore

Adjust snapshot index resolution behavior to be more intuitive #79670 (issue: #78320)

Deprecations

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

Improve transform deprecation messages #81847 (issues: #81521, #81523)

Enhancements

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

Batch rollover cluster state updates #79945 (issues: #77466, #79782)
Reuse MappingMetadata instances in Metadata class #80348 (issues: #69772, #77466)

Infra/Settings

Implement setting deduplication via string interning #80493 (issues: #77466, #78892)

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

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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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.0.0-rc1.html