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Elasticsearch version 8.2.1

Also see Breaking changes in 8.2.

Known issues

Parsing a request when the last element in an array is filtered out (for instance using _source_includes) fails. This is due to a bug in Jackson parser. Fixed in Elasticsearch 8.6.1 (#91456)

Bug fixes

Aggregations

Fix AdaptingAggregator toString method #86042
Less complexity in after-key parsing for unmapped fields #86359 (issue: #85928)

Authentication

Ensure authentication is wire compatible when setting user #86741 (issue: #86716)

Cluster Coordination

Avoid breaking add/clear voting exclusions #86657

Geo

Fix bounded hexagonal grids when they contain the bin on one of the poles #86460
Fix mvt polygon orientation #86555 (issue: #86560)

ILM+SLM

Fix max_primary_shard_size resize factor math #86897
Reroute after migrating to data tiers routing #86574 (issue: #86572)

Infra/Core

Fix assertDefaultThreadContext enumerating allowed headers #86262
Forward port MDP deprecation info API #86103
Make data directories work with symlinks again #85878 (issue: #85701)
Set autoexpand replicas on Fleet actions data stream #85511
Do not autocreate alias for non-primary system indices #85977 (issue: #85072)

Ingest

Don’t download geoip databases if geoip system index is blocked #86842
Fix NPE when using object field as match field for enrich policy #86089 (issue: #86058)
Handle .geoip_databases being an alias or a concrete index #85792 (issue: #85756)

Machine Learning

Adjust memory overhead for PyTorch models #86416
Fix max_model_memory_limit reported by _ml/info when autoscaling is enabled #86660
Improve reliability of job stats in larger clusters #86305
Make autoscaling and task assignment use same memory staleness definition #86632 (issue: #86616)
Fix edge case which could cause the model bounds to inflate after detecting seasonality #2261

Packaging

Fix edge case where user-defined heap settings are ignored #86438 (issue: #86431)

Security

Authentication.token now uses version from the existing authentication #85978

Snapshot/Restore

Better failure for source-only snapshots of partially/fully mounted indices #86207
Check if searchable snapshots cache pre-allocation is successful in Windows #86192 (issue: #85725)
Delay searchable snapshot allocation during shutdown #86153 (issue: #85052)
Support generating AWS role session name in case it’s not provided #86255

Stats

Correctly calculate disk usage for frozen data tier telemetry #86580 (issue: #86055)

Upgrades

Packaging

Switch to OpenJDK and upgrade to 18.0.1 #86554

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https://www.elastic.co/guide/en/elasticsearch/reference/8.17/release-notes-8.2.1.html