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Elasticsearch version 7.17.0

Known issues

Elasticsearch fails to parse system index migration data from the cluster state (issue: #84115)
Feature migration refuses to run if all features requiring upgrade have encountered errors (issue: #83917)
Migrating system indices fails for tasks with mapper_parsing_exception (issue: #83779)

These issues will impact any subsequent upgrade to 8.x, and are fixed in 7.17.1. We strongly recommend that all users upgrade to a later patch release of 7.17 before upgrading to 8.x.

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)

Deprecations

Mapping

Remove too_many_fields upgrade check #82809 (issues: #81539, #81850)

Transform

Improve transform deprecation messages #81853 (issues: #81521, #81523)

Enhancements

Audit

Emit trace.id into audit logs #82849 (issue: #74210)

Authorization

Allow read template with cluster monitor privilege #82046 (issue: #78832)
Make authorization performance log message configurable and disabled by default #82648 (issue: #75439)
Add Kibana system permissions for Endpoint action indices #81953

ILM+SLM

Add an index→step cache to the PolicyStepsRegistry #82316 (issue: #77466)
Migrate legacy/v2/component templates away from custom attributes routing #82472 (issue: #82170)
Migrate to data tiers API dry run on any ILM status #82226 (issue: #82169)

Infra/Core

Allow scaling executors to reject tasks after shutdown #81856 (issues: #77017, #77178)
Prevent direct upgrade of indices from 6.8 to 8.0 #82689 (issue: #81326)

Infra/Logging

Adjust ILM policy for deprecation logs #82833
Do no use x-opaque-id for deduplicating Elastic originating requests #82855 (issue: #82810)

Infra/Settings

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

Java Low Level REST Client

Expose HTTP client and allow overriding meta header #81955

License

Add DEBUG log when document level security and field level security usage is detected #82182 (issue: #79152)

Machine Learning

Move datafeed stats action off of master node #82271

Watcher

Prevent watcher from starting if its templates are missing #82395

Bug fixes

Aggregations

Fix bucket keys format for range aggregations on float field #81801 (issue: #81749)
Fix cardinality aggregation in asynchronous search #82108
Fix missing fields in range aggregation response for date fields #82732 (issue: #82688)

Allocation

Correct context for batched reroute notifications #83019

Authorization

Fix field level security for frozen tier #82521 (issues: #78988, #82044)

CRUD

Fix potential listener leak in TransportBulkAction #81894

Geo

Handle degenerated rectangles in vector tiles #82404 (issue: #81891)
GeoPolygonDecomposer might fail due to numerical errors when calculating intersection with the dateline #82953 (issue: #82840)

ILM+SLM

Migrate the coldest node attribute for data tier routing #81940 (issue: #81633)
Retry ILM step to safely refresh the cached phase #82613 (issue: #81921)
Fix ILM allocate action to allow only total_shards_per_node #81944 (issue: #81943)

Indices APIs

Make the rollover API respect the request’s master_timeout #82326 (issue: #81762)

Infra/Core

Allow clearing blocks on managed system indices #82507 (issue: #80814)

Infra/Logging

Add doPrivileged section in deprecation logger #81819 (issue: #81708)
Always emit product origin to deprecation log if present #83115

Ingest

Filter enrich policy index deletes to just the policy’s associated indices #82568
Fix enrich cache corruption bug #82441 (issue: #82340)

Java Low Level REST Client

Fix version resolution and encoding in LLRC #81989

Machine Learning

Fix annotations index maintenance after reindexing #82304 (issue: #82250)
Improve cleanup for model snapshot upgrades #81831 (issue: #81578)
Make delete intervening results more selective #82437
Skip time to next interval with data for datafeeds with aggs #82488 (issue: #82406)
Update running process when global calendar changes #83044
Avoid transient poor time series modeling after detecting new seasonal components. This can affect cases where there are fast and slow repeats in the data, for example 30 minutes and 1 day, and the job uses a short bucket length. #2167 (issue: #2166)

Monitoring

Always attempt upgrade monitoring templates #82713 (issue: #82453)

Network

Correct context for ClusterConnManager listener #83035

Search

Fix bug where field is not returned if it has the same prefix as a nested field #82922 (issue: #82905)

Settings

Change deprecation.skip_deprecated_settings to work with dynamic settings #81836
Check both node and cluster settings in NodeDeprecationChecks #82487 (issue: #82484)
Ignore dynamic settings specified by deprecation.skip_deprecated_settings in node deprecation checks #82883 (issue: #82889)

Snapshot/Restore

Always fail snapshot deletion listeners on master failover #82361 (issue: #81596)
Fix potential repository corruption during master failover #82912 (issue: #82911)
Remove requirement for key setting on Azure client settings #82030
Support GKE workload identity for searchable snapshots #82974 (issue: #82702)

Stats

Correct context for CancellableSOCache listener #83021

Upgrades

Search

Upgrade to Lucene 8.11.1 #81900

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.17.0.html