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Elasticsearch version 7.17.5

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

Aggregations

Allow serial_diff under min_doc_count aggs #86401
Fix a bug with flattened fields in terms aggregations #87392

Audit

Fix audit logging to consistently include port number in origin.address #86732
Support removing ignore filters for audit logging #87675 (issue: #68588)

CCR

Prevent invalid datastream metadata when CCR follows a datastream with closed indices on the follower #87076 (issue: #87048)
Remove some blocking in CcrRepository #87235

Cluster Coordination

Small fixes to clear voting config excls API #87828

Engine

Fork to WRITE thread before failing shard in updateCheckPoints #87458 (issue: #87094)

Geo

Guard for adding null value tags to vector tiles #87051

Highlighting

FastVectorHighlighter should use ValueFetchers to load source data #85815 (issues: #75011, #84690, #82458, #80895)
FastVectorHighlighter should use ValueFetchers to load source data #87445 (issues: #75011, #84690, #82458, #80895)

ILM+SLM

Fix max_primary_shard_size resize factor math #86897

Indices APIs

Make GetIndexAction cancellable #87681

Infra/Circuit Breakers

Make CBE message creation more robust #87881

Infra/Core

Adjust osprobe assertion for burst cpu #86990
Clean up DeflateCompressor after exception #87163 (issue: #87160)
Prevent migration of indices that match templates #87933 (issues: #86801, #87827)

Infra/Scripting

Script: Load Whitelists as Resource #87539

Ingest

Don’t download geoip databases if geoip system index is blocked #86842

Java Low Level REST Client

Do not retry client requests when failing with ContentTooLargeException #87248 (issue: #86041)

Machine Learning

Adjacency weighting fixes in categorization #2277
Fix a source of "Discarding sample = nan, weights = …" log errors for time series anomaly detection #2286
Fix ML task auditor exception early in cluster lifecycle #87023 (issue: #87002)

Recovery

Do not leak recover from snapshot file permits when recover from snapshot is disabled #87633 (issue: #86705)
Fail shard if STARTED after master failover #87451 (issue: #87367)

Search

Handle empty point values in DiskUsage API #87826 (issue: #87761)
Make sure to rewrite explain query on coordinator #87013 (issue: #64281)

Security

Security plugin close releasable realms #87429 (issue: #86286)

Snapshot/Restore

Fork after calling getRepositoryData from StoreRecovery #87254 (issue: #87237)
Fork after calling getRepositoryData from StoreRecovery #87264 (issue: #87237)
Throw exception on illegal RepositoryData updates #87654

Stats

Run TransportClusterInfoActions on MANAGEMENT pool #87679

Enhancements

Discovery-Plugins

Remove redundant jackson dependencies from discovery-azure #87898

Infra/Core

Force property expansion for security policy #87396

Machine Learning

Make ML native processes work with glibc 2.35 (required for Ubuntu 22.04) #2272
Improve normalization of anomaly detection results for short bucket lengths. This corrects bias which could cause our scoring to be too low for these jobs #2285 (issue: #2276)

Packaging

Remove vim-tiny from Docker build #87812 (issue: #85634)

Performance

Warn about impact of large readahead on search #88007

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https://www.elastic.co/guide/en/elasticsearch/reference/7.17/release-notes-7.17.5.html