Bump Elasticsearch to a minimum of JDK 21
Preparation for the bump to a minimum of JDK 21.
For now, just fleshing out issues that will be addressed in separate PRs.
relates #112249 #112251
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
@elasticmachine update branch
It might be worth a shout out to es-admin on this one since folks will now be required to use a Java 21 JDK locally when building the main branch.