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Elasticsearch Guide [7.9] » Release notes » Elasticsearch version 7.9.2
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Elasticsearch version 7.9.2edit

Also see Breaking changes in 7.9.

Known issuesedit

  • 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.

  • Snapshot and restore: If an index is deleted while the cluster is concurrently taking more than one snapshot then there is a risk that one of the snapshots may never complete and also that some shard data may be lost from the repository, causing future restore operations to fail. To mitigate this problem, prevent concurrent snapshot operations by setting snapshot.max_concurrent_operations: 1.

    This issue is fixed in Elasticsearch versions 7.13.1 and later. For more details, see #73456.

Deprecationsedit

Infra/Plugins
  • Deprecate xpack.eql.enabled setting and make it a no-op #61375 (issue: #54745)

Enhancementsedit

Mapping
  • Improve error messages on bad [format] and [null_value] params for date mapper #61932 (issue: #61712)

Bug fixesedit

Aggregations
Analysis
Authentication
  • Ensure domain_name setting for AD realm is present #61859
  • Update authc failure headers on license change #61734 (issue: #56318)
Authorization
  • Ensure authz operation overrides transient authz headers #61621
CCR
  • CCR should retry on CircuitBreakingException #62013 (issue: #55633)
EQL
  • Create the search request with a list of indices #62005 (issue: #60793)
Engine
  • Allow enabling soft-deletes on restore from snapshot #62018 (issue: #61969)
Features/Data streams
  • Always validate that only a create op is allowed in bulk api for data streams #62766 (issue: #62762)
  • Fix NPE when deleting multiple backing indices on a data stream #62274 (issue: #62272)
  • Fix data stream wildcard resolution bug in eql search api. #61904 (issue: #60828)
  • Prohibit the usage of create index api in namespaces managed by data stream templates #62527
Features/ILM+SLM
  • Fix condition in ILM step that cannot be met #62377
Features/Ingest
  • Add Missing NamedWritable Registration for ExecuteEnrichPolicyStatus #62364
Features/Java High Level REST Client
  • Drop assertion that rest client response warnings conform to RFC 7234 #61365 (issues: #60889, #61259)
Infra/Packaging
Machine Learning
  • Add null checks for C++ log handler #62238
  • Persist progress when setting data frame analytics task to failed #61782
  • Fix reporting of peak memory usage in memory stats for data frame analytics #1468
  • Fix reporting of peak memory usage in model size stats for anomaly detection #1484
Mapping
  • Allow empty null values for date and IP field mappers #62487 (issues: #57666, #62363)
  • Take resolution into account when parsing date null value #61994
Network
  • Log alloc description after netty processors set #62741
SQL
  • Do not resolve self-referencing aliases #62382 (issue: #62296)
Search
Transform
  • Disable optimizations when using scripts in group_by #60724 (issue: #57332)

Upgradesedit

Infra/Packaging
  • Upgrade the bundled JDK to JDK 15 #62580
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