textproc/elasticsearch7: Update to 7.9.2

Changelog since 7.9.1:

• Deprecations
  • • Infra/Plugins
  • Deprecate xpack.eql.enabled setting and make it a no-op
• Enhancements
  • • Mapping
  • Improve error messages on bad [format] and [null_value] params for date mapper
• Bug fixes
  • • Aggregations
  • Cardinality request breaker leak
  • Fix bug with terms' min_doc_count
    • Analysis
      • Fix standard filter BWC check to allow for cacheing bug
    • Authentication
      • Ensure domain_name setting for AD realm is present
      • Update authc failure headers on license change
    • Authorization
      • Ensure authz operation overrides transient authz headers
    • CCR
      • CCR should retry on CircuitBreakingException
    • EQL
      • Create the search request with a list of indices
    • Engine
  • Allow enabling soft-deletes on restore from snapshot
    • Features/Data streams
  • Always validate that only a create op is allowed in bulk api for data streams
  • Fix NPE when deleting multiple backing indices on a data stream
  • Fix data stream wildcard resolution bug in eql search api.
  • Prohibit the usage of create index api in namespaces managed by data stream templates
    • Features/ILM+SLM
  • Fix condition in ILM step that cannot be met
    • Features/Ingest
  • Add Missing NamedWritable Registration for ExecuteEnrichPolicyStatus
    • Features/Java High Level REST Client
  • Drop assertion that rest client response warnings conform to RFC 7234
  • Infra/Packaging
  • Check glibc version
    • Machine Learning
  • Add null checks for C++ log handler
  • Persist progress when setting data frame analytics task to failed
  • Fix reporting of peak memory usage in memory stats for data frame analytics
  • Fix reporting of peak memory usage in model size stats for anomaly detection
    • Mapping
  • Allow empty null values for date and IP field mappers
  • Take resolution into account when parsing date null value
    • Network
  • Log alloc description after netty processors set
    • SQL
  • Do not resolve self-referencing aliases
    • Search
  • Fix disabling allow_leading_wildcard
  • Search memory leak
    • Transform
  • Disable optimizations when using scripts in group_by
• Upgrades
  • • Infra/Packaging
  • Upgrade the bundled JDK to JDK 15

Release notes:
https://www.elastic.co/guide/en/elasticsearch///reference/current/release-notes-7.9.2.html

PR: 249915
Submitted by: Juraj Lutter <juraj@lutter.sk>