Revert "[TEST] use logger level from test class annotation also in external nodes"

This reverts commit 4604a68bef9c54f5db812609157b18788279012d.
Add missing await into an interruptable block
[TEST] Delete index in test to release file handles
[INDEX] Add before/after indexDeleted callbacks to IndicesLifecycle

In order to implement #8551 correctly without causing problems of relocating
shards we need to be informed if an index is actually deleted. This commit adds
more callbacks to the listener and makes deleteIndex a dedicated method on IndicesService