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Elasticsearch version 8.0.0-alpha2

Also see Breaking changes in 8.0.

Breaking changes

ILM+SLM

Make the ILM freeze action a no-op #77158 (issue: #70192)

Infra/Core

Fail index creation using custom data path #76792 (issue: #73168)
System indices treated as restricted indices #74212 (issue: #69298)

License

Set xpack.security.enabled to true for all licenses #72300

Packaging

Remove no-jdk distributions #76896 (issue: #65109)

Security

Remove kibana_dashboard_only_user reserved role #76507

Enhancements

Authentication

Autogenerate and print elastic password on startup #77291
Enroll Kibana API uses Service Accounts #76370
Add reset-kibana-system-user tool #77322

ILM+SLM

Allow for setting the total shards per node in the Allocate ILM action #76794 (issue: #76775)

Infra/Core

Retain reference to stdout for exceptional cases #77460

Ingest

Add support for _meta field to ingest pipelines #76381

Machine Learning

Adding new PUT trained model vocabulary endpoint #77387
Creating new PUT model definition part API #76987

Network

Enable LZ4 transport compression by default #76326 (issue: #73497)

Search

[REST API Compatibility] Nested path and filter sort options #76022 (issues: #42809, #51816)
[REST API Compatibility] CommonTermsQuery and cutoff_frequency parameter #75896 (issues: #42654, #51816)
[REST API Compatibility] Allow first empty line for _msearch #75886 (issues: #41011, #51816)

Security

Adding base RestHandler class for Enrollment APIs #76564 (issue: #76097)
Generate and store password hash for elastic user #76276 (issue: #75310)
Set elastic password and generate enrollment token #75816 (issue: #75310)
Add elasticsearch-enroll-node tool #77292
Default hasher to PBKDF2_STRETCH on FIPS mode #76274

Bug Fixes

ILM+SLM

Ensuring that the ShrinkAction does not hang if total shards per node is too low #76732 (issue: #44070)

Security

Allow access to restricted system indices for reserved system roles #76845

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.0.0-alpha2.html