Christoph Büscher 56625e35b7 Fix bool query behaviour on null value (#56817)
Until 7.7 we used to ignore `null` values for `bool`queries `minimum_should_match`,
parameters and also for the `must`,  `must_not`, `should` and `filter` clauses.
An internal refactoring has changed this so now we get a parsing error. While `null` 
should not a common value here, we should restore the old behaviour for bwc for now.

Closes #56812
2020-05-26 16:23:40 +02:00
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