v2: Let FunctionScoreQuery allow both Query and Filter #587
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Previously, FunctionScoreQuery only allowed either Query or Filter to be set,
setting the other to nil. There's no reason to do this, though, as
ElasticSearch allows both to be set.
See the equivalent Java code here:
https://github.com/elastic/elasticsearch/blob/v1.7.6/src/main/java/org/elasticsearch/index/query/functionscore/FunctionScoreQueryBuilder.java#L85-L88