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Elasticsearch version 7.8.1

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Elasticsearch version 7.8.1

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Also see Breaking changes in 7.8.

Known issues

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SQL: If a WHERE clause contains at least two relational operators joined by AND, of which one is a comparison (<=, <, >=, >) and another one is an inequality (!=, <>), both against literals or foldable expressions, the inequality will be ignored. The workaround is to substitute the inequality with a NOT IN operator.

We have fixed this issue in Elasticsearch 7.10.1 and later versions. For more details, see #65488.
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)

Breaking changes

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License

Display enterprise license as platinum in /_xpack #58217

New features

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SQL

Implement SUM, MIN, MAX, AVG over literals #56786 (issues: #41412, #55569)

Enhancements

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Authorization

Add read privileges for observability-annotations for apm_user #58530 (issues: #64796, #69642, #69881)

Features/Indices APIs

Change "apply create index" log level to DEBUG #56947
Make noop template updates be cluster state noops #57851 (issue: #57662)
Rename template V2 classes to ComposableTemplate #57183 (issue: #56609)

Machine Learning

Add exponent output aggregator to inference #58933

Snapshot/Restore

Allow read operations to be executed without waiting for full range to be written in cache #58728 (issues: #58164, #58477)
Allows SparseFileTracker to progressively execute listeners during Gap processing #58477 (issue: #58164)
Do not wrap CacheFile reentrant r/w locks with ReleasableLock #58244 (issue: #58164)
Use snapshot information to build searchable snapshot store MetadataSnapshot #56289

Transform

Improve update API #57648 (issue: #56499)

Bug fixes

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CCR

Ensure CCR partial reads never overuse buffer #58620

Cluster Coordination

Suppress cluster UUID logs in 6.8/7.x upgrade #56835
Timeout health API on busy master #57587

Engine

Fix realtime get of numeric fields from translog #58121 (issue: #57462)

Features/ILM+SLM

Fix negative limiting with fewer PARTIAL snapshots than minimum required #58563 (issue: #58515)

Features/Indices APIs

Fix issue reading template mappings after cluster restart #58964 (issues: #58521, #58643, #58883)
ITV2: disallow duplicate dynamic templates #56291 (issues: #28988, #53101, #53326)

Features/Stats

Fix unnecessary stats warning when swap is disabled #57983

Geo

Fix max-int limit for number of points reduced in geo_centroid #56370 (issue: #55992)
Re-enable support for array-valued geo_shape fields. #58786

Infra/Core

Week based parsing for ingest date processor #58597 (issue: #58479)

Machine Learning

Allow unran/incomplete forecasts to be deleted for stopped/failed jobs #57152 (issue: #56419)
Fix inference .ml-stats-write alias creation #58947 (issue: #58662)
Fix race condition when force stopping data frame analytics job #57680
Handle broken setup with state alias being an index #58999 (issue: #58482)
Mark forecasts for force closed/failed jobs as failed #57143 (issue: #56419)
Better interrupt handling during named pipe connection #1311
Trap potential cause of SIGFPE #1351 (issue: #1348)
Correct inference model definition for MSLE regression models #1375
Fix cause of SIGSEGV of classification and regression #1379
Fix restoration of change detectors after seasonality change #1391
Fix potential SIGSEGV when forecasting #1402 (issue: #1401)

Network

Close channel on handshake error with old version #56989 (issue: #54337)

Percolator

Fix nested document support in percolator query #58149 (issue: #52850)

Recovery

Fix recovery stage transition with sync_id #57754 (issues: #57187, #57708)

SQL

Fix behaviour of COUNT(DISTINCT <literal>) #56869
Fix bug in resolving aliases against filters #58399 (issues: #57270, #57417)
Fix handling of escaped chars in JDBC connection string #58429 (issue: #57927)
Handle MIN and MAX functions on dates in Painless scripts #57605 (issue: #57581)

Search

Ensure search contexts are removed on index delete #56335
Filter empty fields in SearchHit#toXContent #58418 (issue: #41656)
Fix exists query on unmapped field in query_string #58804 (issues: #55785, #58737)
Fix handling of terminate_after when size is 0 #58212 (issue: #57624)
Fix possible NPE on search phase failure #57952 (issues: #51708, #57945)
Handle failures with no explicit cause in async search #58319 (issues: #57925, #58311)
Improve error handling in async search code #57925 (issue: #58995)
Prevent BigInteger serialization errors in term queries #57987 (issue: #57917)
Submit async search to not require read privilege #58942

Snapshot/Restore

Fix Incorrect Snapshot Shar Status for DONE Shards in Running Snapshots #58390
Fix Memory Leak From Master Failover During Snapshot #58511 (issue: #56911)
Fix NPE in SnapshotService CS Application #58680
Fix Snapshot Abort Not Waiting for Data Nodes #58214
Remove Overly Strict Safety Mechnism in Shard Snapshot Logic #57227 (issue: #57198)

Task Management

Cancel persistent task recheck when no longer master #58539 (issue: #58531)
Ensure unregister child node if failed to register task #56254 (issues: #54312, #55875)

Transform

Fix page size return in cat transform, add dps #57871 (issues: #56007, #56498)

Upgrades

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Infra/Core

Upgrade to JNA 5.5.0 #58183

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