With the updated fine grained control if filters are cached or not, there is no need to cache the filters on the constant_score or filtered query level. Default _cache to false (really, it usually should not even be set).
Query DSL: constant_score and filtered queries cache filters by default, remove it, closed by deada94.
Query DSL: `constant_score` and `filtered` queries cache filters by d…
…efault, remove it, closes #449.