Ability to delete an index if expecting an alias
fix warning if no aliases
PHP Warning:  array_keys() expects parameter 1 to be array, AliasProcessor.php on line 128
Merge remote-tracking branch 'upstream/pr/704' into 3.0.x
Merge remote-tracking branch 'upstream/pr/705' into 3.0.x

Conflicts:
	Index/AliasProcessor.php
Fix previous merge