Elasticsearch version 8.0.0-alpha2
  
Also see Breaking changes in 8.0.
Breaking changes
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ILM+SLM
 
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Infra/Core
 
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Fail index creation using custom data path #76792 (issue: #73168)
 
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System indices treated as restricted indices #74212 (issue: #69298)
 
 
 
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License
 
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Set 
xpack.security.enabled to true for all licenses #72300
 
 
 
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Packaging
 
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Security
 
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Remove 
kibana_dashboard_only_user reserved role #76507
 
 
 
 
Enhancements
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Authentication
 
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Autogenerate and print elastic password on startup #77291
 
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Enroll Kibana API uses Service Accounts #76370
 
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Add 
reset-kibana-system-user tool #77322
 
 
 
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ILM+SLM
 
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Allow for setting the total shards per node in the Allocate ILM action #76794 (issue: #76775)
 
 
 
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Infra/Core
 
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Retain reference to stdout for exceptional cases #77460
 
 
 
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Ingest
 
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Add support for 
_meta field to ingest pipelines #76381
 
 
 
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Machine Learning
 
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Adding new PUT trained model vocabulary endpoint #77387
 
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Creating new PUT model definition part API #76987
 
 
 
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Network
 
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Enable LZ4 transport compression by default #76326 (issue: #73497)
 
 
 
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Search
 
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[REST API Compatibility] Nested path and filter sort options #76022 (issues: #42809, #51816)
 
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[REST API Compatibility] 
CommonTermsQuery and cutoff_frequency parameter #75896 (issues: #42654, #51816)
 
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[REST API Compatibility] Allow first empty line for 
_msearch #75886 (issues: #41011, #51816)
 
 
 
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Security
 
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Adding base 
RestHandler class for Enrollment APIs #76564 (issue: #76097)
 
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Generate and store password hash for elastic user #76276 (issue: #75310)
 
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Set elastic password and generate enrollment token #75816 (issue: #75310)
 
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Add 
elasticsearch-enroll-node tool #77292
 
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Default hasher to 
PBKDF2_STRETCH on FIPS mode #76274
 
 
 
 
Bug Fixes
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ILM+SLM
 
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Ensuring that the 
ShrinkAction does not hang if total shards per node is too low #76732 (issue: #44070)
 
 
 
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Security
 
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Allow access to restricted system indices for reserved system roles #76845