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Elasticsearch version 7.17.4

Also see Breaking changes in 7.17.

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)
The deprecated index.mapper.dynamic setting can break your cluster. It can only be set using the Update index settings API. Symptoms include nodes failing to start or shards failing to allocate. Do not use this setting in versions prior to 7.17.22. The bug is fixed in 7.17.22. (issue: #109160)

Bug fixes

Cluster Coordination

Avoid breaking add/clear voting exclusions #86657

Geo

Fix mvt polygon orientation #86555 (issue: #86560)

ILM+SLM

Reroute after migrating to data tiers routing #86574 (issue: #86572)

Infra/Core

Fix assertDefaultThreadContext enumerating allowed headers #86262
Relax data path deprecations from critical to warn #85952
Set autoexpand replicas on fleet actions data stream #85511

Infra/Settings

Adjust MDP deprecation to warning instead of critical #86102 (issue: #85695)

Machine Learning

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
Fix cause of "Must provide points at which to evaluate function" log error training classification and regression models #2268

Packaging

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

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)

Stats

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

Task Management

Use TaskCancelledException in TMNA #86659

Upgrades

Packaging

Switch to OpenJDK and upgrade to 18.0.1 #86554

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.17.4.html