Query DSL: queryString - allow to run against multiple fields

[kimchy]

The current queryString requires to define the defaultField in order to run the query against a default field. Running the same query string against several "default" fields can be done by combining them either with bool or disMax queries, but its cumbersome.

queryString should support providing a "fields" field, where a list of fields the query will run against will be provided. An option to choose if the query will be combined using disMax or bool should be a simple flag. A tieBreaker field allowed when using disMax.

Sample 1:

{
    queryString : {
        fields : ["content", "name"],
        useDisMax : false,
        query: "test"
    }
}

Sample 2:

{
    queryString : {
        fields : ["content", "name"],
        useDisMax : true,
        query: "test"
    }
}

Boosting per field should be allowed, for example:

{
    queryString : {
        fields : ["content^1.4", "name"],
        query: "test"
    }
}

[kimchy]

Query DSL: queryString - allow to run against multiple fields, closed by fdd221e.