Removes `testenv` annotations and related code. These annotations originally let you skip x-pack snippet tests in the docs. However, that's no longer possible.
Relates to #79309, #31619
* WIP, basic implementation
* Pull `if` branch into a variable
* Remove outdated javadoc
* Remove map iteration, use target name instead of id (whoops)
* Remove streaming from isReplacementSource
* Simplify getReplacementName
* Only calculate node shutdowns if canRemain==false and forceMove==false
* Move canRebalance comment in BalancedShardsAllocator
* Rename canForceDuringVacate -> canForceAllocateDuringReplace
* Add comment to AwarenessAllocationDecider.canForceAllocateDuringReplace
* Revert changes to ClusterRebalanceAllocationDecider
* Change "no replacement" decision message in NodeReplacementAllocationDecider
* Only construct shutdown map once in isReplacementSource
* Make node shutdowns and target shutdowns available within RoutingAllocation
* Add randomization for adding the filter that is overridden in test
* Add integration test with replicas: 1
* Go nuts with the verbosity of allocation decisions
* Also check NODE_C in unit test
* Test with randomly assigned shard
* Fix test for extra verbose decision messages
* Remove canAllocate(IndexMetadat, RoutingNode, RoutingAllocation) overriding
* Spotless :|
* Implement 100% disk usage check during force-replace-allocate
* Add rudimentary documentation for "replace" shutdown type
* Use RoutingAllocation shutdown map in BalancedShardsAllocator
* Add canForceAllocateDuringReplace to AllocationDeciders & add test
* Switch from percentage to bytes in DiskThresholdDecider force check
* Enhance docs with note about rollover, creation, & shrink
* Clarify decision messages, add test for target-only allocation
* Simplify NodeReplacementAllocationDecider.replacementOngoing
* Start nodeC before nodeB in integration test
* Spotleeeessssssss! You get me every time!
* Remove outdated comment
* Put Shutdown API docs
* Get Shutdown API docs
* Properly escape regex
* Doc tests build now! (but don't pass)
* Doc tests pass now! (with a code fix that will go in a different PR)
* DELETE shutdown docs
* Edit for language & consistency
* Fix doctest
* Add cloud-only banner
* Add allocation_delay docs
* Restore file that got deleted somehow?
* Use `restart` type in example to demonstrate `allocation_delay` param
* Fix typo per review
Co-authored-by: debadair <debadair@elastic.co>
* Vastly improve wording per review
Co-authored-by: debadair <debadair@elastic.co>
* Adjust test request & response so it passes
Co-authored-by: Deb Adair <debadair@elastic.co>
Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>
