ES使用场景及方法

1.区间统计.通常用于柱状图 每个范围内的量. 比如价格范围的商品数, 年龄范围的人数, 分数范围的人数等等.
可以概括为某个指标范围内的出现次数.
参考来源: http://www.cnblogs.com/xing901022

{
    "aggs":{
        "grade_ranges":{
            "range":{
                "field":"grade",
                "ranges":[
                    {"to":60},
                    {"from":60,"to":80},
                    {"from":80}]
                }
            }
        }
}

结果

{
    ...
    "aggregations":{
        "price_ranges":{
            "buckets":[
                {
                    "to":60,
                    "doc_count":2
                },
                {
                    "from":60,
                    "to":80,
                    "doc_count":32
                },
                {
                    "from":80,
                    "doc_count":14
                }
            ]
        }
    }
}

指定区间名称

{
    "aggs":{
        "price_ranges":{
            "range":{
                "field":"price",
                "keyed":true,
                "ranges":[
                    {"key":"cheap","to":50},
                    {"key":"average","from":50,"to":100},
                    {"key":"expensive","from":100}
                ]
            }
        }
    }
}