Multi word query in elasticsearch with filter

{ "query": { "bool": { "must": [ { "match": { "Category": "Sport" } }, { "multi_match": { "query": "world series", "type": "cross_fields", "operator": "and", "fields": [ "Question", "Answer" ] } } ], "must_not": [], "should": [] } }, "from": 0, "size": 10, "sort": [], "aggs": {} }