1.avg 平均

localhost:9200/account/_search
{                                                             
    "aggs":{  
        "avg_id":{      自定义名字
            "avg":{     关键字
                "field":"id"   字段
            }
        }
    },
      "size":0
}

结果：

{
    "took": 15,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 990,
            "relation": "eq"
        },
        "max_score": null,
        "hits": []
    },
    "aggregations": {
        "avg_id": {
            "value": 496.7030303030303
        }
    }
}

2.cardinality 基数

相当于sql group by之后的总条数

{
    "aggs" : {
        "type_count" : {
            "cardinality" : {
                "field" : "id"
            }
        }
    },
    "size":0
}

3.extended_stats 扩展统计

返回max min avg count sum sum_of_squares variance(方差) std_deviation(偏差) std_deviation_bounds(偏差边界，平均值+-两个偏差)

{
    "size": 0,
    "aggs": {
        "e-stats": {
            "extended_stats": {
                "field": "id"
            }
        }
    }
}
{
    ...

    "aggregations": {
        "grades_stats": {
           "count": 2,
           "min": 50.0,
           "max": 100.0,
           "avg": 75.0,
           "sum": 150.0,
           "sum_of_squares": 12500.0,
           "variance": 625.0,
           "std_deviation": 25.0,
           "std_deviation_bounds": {
            "upper": 125.0,
            "lower": 25.0
           }
        }
    }
}

4.max 最大

{
    "aggs": {
        "max_id": {
            "max": {
                "field": "id"
            }
        }
    },
    "size":0
}

5.min 最小

{
    "aggs": {
        "min_id": {
            "min": {
                "field": "id"
            }
        }
    },
    "size":0
}

6.percentiles 百分位

评估当前数值分布情况
在对应百分位的值，默认【1,5,25，50,75，95,99】
{
    "aggs": {
        "max_id": {
            "percentiles": {
                "field": "num",
                "percents":[10]  //返回特定百分位的值
            }
        }
    },
    "size":0
}

7.percentile_ranks 百分位排名

当前数值中处于哪一个范围内，查它的 rank，发现是100，那么说明有100%的数值都在10以内。
{
    "aggs": {
        "max_id": {
            "percentile_ranks ": {
                "field": "num", 
                "values":[10,50]  //返回特定百分位的值
            }
        }
    },
    "size":0
}

8.stats 统计

返回 min  max  sum  count  avg 
{
    "aggs": {
        "min_id": {
            "stats": {
                "field": "num"
            }
        }
    },
    "size":0
}

9.sum 求和

{
    "aggs": {
        "max_id": {
            "sum": {
                "field": "num"
            }
        }
    },
    "size":0
}

10.value_count 个数统计

{
    "aggs": {
        "max_id": {
            "sum": {
                "field": "num"
            }
        }
    },
    "size":0
}