{"query": {
                "bool": {
                    "should": [
                        {"match_phrase":{
                             "_all": {
                                    "query":string,
                                    "boost":5
                                    }}}
                    ]
                }
            }
        }

{"query": {
                    "bool": {
                        "should": [
                            {"match_phrase":{
                                 "_all": {
                                        "query":string,"fields":[filed_name],
                                        "boost":5
                                        }}}
                        ]
                    }
                }
            }