Java 17 features in Elasticsearch code base

[astefan]

This is a meta issue for tracking Java 17 features implementation in Elasticsearch. The work is composed of the following tasks:

• [x] Pattern matching for instanceof. Tasks are divided between folders under https://github.com/elastic/elasticsearch. The split also takes into consideration that some of the above mentioned folders do not contain any instanceof occurrences that can be transitioned to pattern matching.
  • [x] x-pack/plugin/analytics through x-pack/plugin/enrich @astefan #https://github.com/elastic/elasticsearch/pull/81812
  • [x] x-pack/plugin/eql through x-pack/plugin/searchable-snapshots @astefan https://github.com/elastic/elasticsearch/pull/81936
  • [x] x-pack/plugin/security through x-pack/plugin/wildcard @astefan https://github.com/elastic/elasticsearch/pull/81996
  • [x] build-conventions through modules
  • [x] ingest modules (https://github.com/elastic/elasticsearch/pull/81656)
  • [x] build-conventions through modules folders except ingest modules @astefan https://github.com/elastic/elasticsearch/pull/82341
  • [x] plugins through qa, server/internalClusterTest @gmarouli https://github.com/elastic/elasticsearch/pull/82161
  • [x] server @idegtiarenko https://github.com/elastic/elasticsearch/pull/82074
  • [x] test, x-pack/qa @astefan https://github.com/elastic/elasticsearch/pull/82683
  • [x] Final check for leftovers @astefan https://github.com/elastic/elasticsearch/pull/82768
  • [x] equals @arteam via https://github.com/elastic/elasticsearch/pull/84315
• [x] Text blocks @arteam https://github.com/elastic/elasticsearch/pull/80751
• [x] Improved switch expressions @arteam via https://github.com/elastic/elasticsearch/pull/82178
• [ ] Pattern matching for switch
• [ ] Sealed classes
• [ ] Records
  • [x] Part 1 @arteam https://github.com/elastic/elasticsearch/pull/82338
  • [x] Part 2 @arteam https://github.com/elastic/elasticsearch/pull/82914

[elasticmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)