Elasticsearch version 7.16.1

Elasticsearch version 7.16.1

Also see Breaking changes in 7.16.

Security updates

• A high severity vulnerability (CVE-2021-44228) for Apache Log4j 2 versions 2.0 to 2.14 was disclosed publicly on the project’s GitHub on December 9, 2021.

  For information about affected Elasticsearch versions and mitigation steps, see our related security announcement.

Known issues

• Painless: Any Painless script where a method call resolves a lambda argument to a UnaryOperator or a BinaryOperator type results in an IllegalArgumentException. This exception results in a compilation error when static types are used, or a runtime error for dynamic types. Use standard procedural statements as a workaround, such as if/else, while, and for statements.

  The following example is a UnaryOperator type that will result in a failure:

  List l = ['abc', '123']; l.replaceAll(f -> f.replace('abc', 'doremi');

  The following example is a possible workaround:

  List l = ['abc', '123'];
  for (int i = 0; i < l.size(); ++i) {
      l.set(i, l.get(i).replace('abc', 'doremi'));
  }

• 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)

Enhancements

Infra/Logging

• Disable JNDI lookups via the log4j2.formatMsgNoLookups system property #81622
• Patch log4j jar to remove the JndiLookup class from the classpath #81629

Infra/Core

• Allow plugins permission to register MBeans #81508 (issue: #76329)

Other

• Deprecate multifield mappings templates #81329 (issue: #78445)

Bug fixes

Autoscaling

• Calculate autoscaling capacity off the transport threads #80499 (issue: #79104)

CCR

• Stop auto-followers when resetting metadata #81290 (issues: #81242, #81247)

ILM+SLM

• Allow the unfollow action in the frozen phase #81434

Indices APIs

• Implement getMinimalSupportedVersion for all NameDiffs #81374 (issue: #81262)

Infra/Core

• Allow configuration of ThreadPool warning times #81487

Infra/Logging

• Add trace.id to indexed deprecation logs #81524

Infra/Scripting

• Use the implicit context cache #81552 (issue: #81486)

Machine Learning

• Make model snapshot upgrade autoscaling friendly #81123 (issue: #81012)

Network

• Fail fast remote cluster requests when skip_unavailable is true #80589 (issue: #74773)
• Fix channel open trace logging #81308

Other

• Adding a deprecation info API check for discovery.zen.minimum_master_nodes #81282 (issue: #81260)

SQL

• Fix metrics reporting when sorting on aggregated values #81510 (issue: #81502)
• Fix rearranging columns in PIVOT queries #81032 (issue: #80952)
• Only resolve aliases if asked for local cluster #81158 (issue: #81157)

Search

• Handle partial search result with point in time #81349 (issue: #81256)

Transform

• Fix wire compatibility version for transform cluster state #81300 (issue: #81292)

• Handle PIT index not found error #81368 (issues: #81252, #81256)

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