es - elasticsearch - aggs - metrics - percentiles

世界上并没有完美的程序，但是我们并不因此而沮丧，因为写程序就是一个不断追求完美的过程。

问：percentiles有什么特点？
答：

问：percentiles如何使用？
答：

DELETE /percentiles_test

PUT /percentiles_test
{
  "mappings": {
    "properties": {
      "num": {"type": "integer"}
    }
  }
}

POST /percentiles_test/_bulk
{"index": {"_id": 1}}
{"num": 1}
{"index": {"_id": 2}}
{"num": 4}
{"index": {"_id": 3}}
{"num": 8}
{"index": {"_id": 4}}
{"num": 12}

GET /percentiles_test/_search
{
  "size": 0,
  "aggs": {
    "percentiles_aggs": {
      "percentiles": {
        "field": "num",
        "percents": [
          1,
          5,
          25,
          50,
          75,
          95,
          100
        ],
        "hdr": {
          "number_of_significant_value_digits": 3
        }
      }
    }
  }
}

# 结果
{
  "took" : 5,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 4,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "aggregations" : {
    "percentiles_aggs" : {
      "values" : {
        "1.0" : 1.0,
        "5.0" : 1.0,
        "25.0" : 1.0,
        "50.0" : 4.0029296875,
        "75.0" : 8.0068359375,
        "95.0" : 12.0068359375,
        "100.0" : 12.0068359375
      }
    }
  }
}