es - elasticsearch - aggs - metrics - t-test

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：t-test有什么特点？
答：

问：t-test如何使用？
答：

DELETE t_test_test;

PUT /t_test_test
{
  "mappings": {
    "properties": {
      "num_1": {"type": "integer"},
      "num_2": {"type": "integer"}
    }
  }
}

POST /t_test_test/_doc/1
{
  "num_1": 3,
  "num_2": 3
}


POST /t_test_test/_doc/2
{
  "num_1": 6,
  "num_2": 3
}


POST /t_test_test/_doc/3
{
  "num_1": 9,
  "num_2": 3
}


GET /t_test_test/_search
{
  "size": 0,
  "aggs": {
    "t_aggs": {
      "t_test": {
        "a": {"field": "num_1"},
        "b": {"field": "num_2"},
        "type": "paired"
      }
    }
  }
}

# 结果
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "aggregations" : {
    "t_aggs" : {
      "value" : 0.22540333075851618
    }
  }
}