Don't hardcode the alias in the filters.

This way you can add more complex filters like '(someField IS NULL)' for a BooleanFilterType and it'll check if the result of this expression is true or not.
Handy to add a filter on the existance of a certain variable in the database.
Merge remote-tracking branch 'origin/old_22_with_fixes' into 2.2

* origin/old_22_with_fixes:
  Don't hardcode the alias in the filters.
composer.json