Minimium_should_match doesn't work with simple_query_string

[riichard]

When I add a minimum_should_match field to my simple_query_string object, it returns an error about an unsupported field.

The error:

QueryParsingException[[owlin-production] [simple_query_string] unsupported field [minimum_should_match]]; }]","status":400}

The query:

{
    simple_query_string: {
        fields: [
            'header',
            'description'
        ],
        query: 'foo',
        minimum_should_match: 2,
        default_operator: 'OR'
    }
}