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elasticSearch扩展统计聚合

发布时间：2021-09-03 11:17:12编辑：雪饮阅读（）

 ElasticSearch扩展统计聚合类似于上篇中的统计汇总。那么就如字面意思，这里统计出来的字段数量比统计汇总统计出来的响应出更多的聚合信息。不仅仅是最大、最小值、平均聚合、求和聚合、count聚合等。

一个请求如：
http://localhost:9200/schools/_search?size=0 post
请求正文：
{
   "aggs" : {
      "fees_stats" : { "extended_stats" : { "field" : "fees" } }
   }
}
响应正文：
{
    "took": 5,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 5,
            "relation": "eq"
        },
        "max_score": null,
        "hits": []
    },
    "aggregations": {
        "fees_stats": {
            "count": 4,
            "min": 2004.0,
            "max": 5000.0,
            "avg": 3876.0,
            "sum": 15504.0,
            "sum_of_squares": 6.6266016E7,
            "variance": 1543128.0,
            "variance_population": 1543128.0,
            "variance_sampling": 2057504.0,
            "std_deviation": 1242.2270323898124,
            "std_deviation_population": 1242.2270323898124,
            "std_deviation_sampling": 1434.4002230897763,
            "std_deviation_bounds": {
                "upper": 6360.454064779625,
                "lower": 1391.5459352203752,
                "upper_population": 6360.454064779625,
                "lower_population": 1391.5459352203752,
                "upper_sampling": 6744.800446179553,
                "lower_sampling": 1007.1995538204474
            }
        }
    }
}