elasticsearch 聚合显示百分比

Question

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
                }
            ]
        }
    }
}

比如我需要求出 (3947 / hits.total.value) * 100