聚合range和percent的组合写法

服务器运行环境信息: Linux
软件版本: 7.10
问题发生的上下文信息；

 使用rang返回的是个数，怎么统计百分比

GET /index-001/_search



{

    "aggs": { //聚合操作

        "diff_time_ranges": { //自定义组名名称

            "range": { //分组

                "field": "diffTime",

                "ranges": [

                    {

                        "to": 60

                    }, // < 1min

                    {

                        "from": 60,

                        "to": 300

                    }, // 1min < x < 5min

                    {

                        "from": 300,

                        "to": 600

                    }, // 5min < x < 10min

                    {

                        "from": 3600

                    } // > 1h

                ]

            }

        }

    },

    "size": 0 //可选, 不带原始数据, 否则："hits":{}这个原始数据也会暴露出来

}

返回结果

{

    "took": 129,

    "timed_out": false,

    "_shards": {

        "total": 5,

        "successful": 5,

        "skipped": 0,

        "failed": 0

    },

    "hits": {

        "total": {

            "value": 3982,

            "relation": "eq"

        },

        "max_score": null,

        "hits": 

    },

    "aggregations": {

        "diff_time_ranges": {

            "buckets": [

                {

                    "key": "*-60.0",

                    "to": 60.0,

                    "doc_count": 3947

                },

                {

                    "key": "60.0-300.0",

                    "from": 60.0,

                    "to": 300.0,

                    "doc_count": 7

                },

                {

                    "key": "300.0-600.0",

                    "from": 300.0,

                    "to": 600.0,

                    "doc_count": 1

                },

                {

                    "key": "3600.0-*",

                    "from": 3600.0,

                    "doc_count": 3

                }

            ]

        }

    }

}

比如我要求出每个range记录占总数的百分比， 比如第一条 (3947 / hits.total.value) * 100，第二条 (7 / hits.total.value) * 100， 估计要写pipeline，请问怎么写呢