The .ml-annotations index is created asynchronously when
some other ML index exists.  This can interfere with the
post-test index deletion, as the .ml-annotations index
can be created after all other indices have been deleted.

This change adds an ML specific post-test cleanup step
that runs before the main cleanup and:

1. Checks if any ML indices exist
2. If so, waits for the .ml-annotations index to exist
3. Deletes the other ML indices found in step 1.
4. Calls the super class cleanup

This means that by the time the main post-test index
cleanup code runs:

1. The only ML index it has to delete will be the
   .ml-annotations index
2. No other ML indices will exist that could trigger
   recreation of the .ml-annotations index

Fixes #38952

The .ml-annotations index is created asynchronously when
some other ML index exists.  This can interfere with the
post-test index deletion, as the .ml-annotations index
can be created after all other indices have been deleted.

This change adds an ML specific post-test cleanup step
that runs before the main cleanup and:

1. Checks if any ML indices exist
2. If so, waits for the .ml-annotations index to exist
3. Deletes the other ML indices found in step 1.
4. Calls the super class cleanup

This means that by the time the main post-test index
cleanup code runs:

1. The only ML index it has to delete will be the
   .ml-annotations index
2. No other ML indices will exist that could trigger
   recreation of the .ml-annotations index

Fixes #38952

The .ml-annotations index is created asynchronously when
some other ML index exists.  This can interfere with the
post-test index deletion, as the .ml-annotations index
can be created after all other indices have been deleted.

This change adds an ML specific post-test cleanup step
that runs before the main cleanup and:

1. Checks if any ML indices exist
2. If so, waits for the .ml-annotations index to exist
3. Deletes the other ML indices found in step 1.
4. Calls the super class cleanup

This means that by the time the main post-test index
cleanup code runs:

1. The only ML index it has to delete will be the
   .ml-annotations index
2. No other ML indices will exist that could trigger
   recreation of the .ml-annotations index

Fixes #38952

The .ml-annotations index is created asynchronously when
some other ML index exists.  This can interfere with the
post-test index deletion, as the .ml-annotations index
can be created after all other indices have been deleted.

This change adds an ML specific post-test cleanup step
that runs before the main cleanup and:

1. Checks if any ML indices exist
2. If so, waits for the .ml-annotations index to exist
3. Deletes the other ML indices found in step 1.
4. Calls the super class cleanup

This means that by the time the main post-test index
cleanup code runs:

1. The only ML index it has to delete will be the
   .ml-annotations index
2. No other ML indices will exist that could trigger
   recreation of the .ml-annotations index

Fixes #38952

As per elastic#39049 (comment)

…ate-file

* elastic/master:
  Remove tests and branches that will never execute (elastic#38772)
  also check ccr stats api return empty response in ensureNoCcrTasks()
  Add overlapping, before, after filters to intervals query (elastic#38999)
  Mute test elastic#38949
  Add remote recovery to ShardFollowTaskReplicationTests (elastic#39007)
  [ML] More advanced post-test cleanup of ML indices (elastic#39049)
  wait for shard to be allocated before executing a resume follow api
  Update track-total-hits.asciidoc
  Force kill testcluster nodes (elastic#37353)
  Make pullFixture a task dependency of resolveAllDependencies (elastic#38956)
  set minimum supported version (elastic#39043)
  Enforce Completion Context Limit (elastic#38675)
  Mute test
  Don't close caches while there might still be in-flight requests. (elastic#38958)
  Fix elastic#38623 remove xpack namespace REST API (elastic#38625)
  Add data frame feature (elastic#38934)
  Test bi-directional index following during a rolling upgrade. (elastic#38962)
  Generate mvn pom for ssl-config library (elastic#39019)
  Mute testRetentionLeaseIsRenewedDuringRecovery

As per #39049 (comment)

As per #39049 (comment)