elasticsearch聚合结果排序

"mainBody": {



    "doc_count_error_upper_bound": 170,

    "sum_other_doc_count": 2707283,

    "buckets": [

        {

            "key": "",

            "doc_count": 8678677,

            "hit": {

                "doc_count_error_upper_bound": 0,

                "sum_other_doc_count": 0,

                "buckets": [

                    {

                        "key": 0,

                        "doc_count": 8200412

                    }

                    ,

                    {

                        "key": 1,

                        "doc_count": 478265

                    }

                ]

            }

        }

        }