es - elasticsearch - aggs - metrics - max

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：max有什么特点？
答：

问：max如何使用？
答：

DELETE /max_test

PUT /max_test
{
  "mappings": {
    "properties": {
      "num_1": {"type": "integer"},
      "num_2": {"type": "integer"},
      "histo": {"type": "histogram"}
    }
  }
}

POST /max_test/_bulk
{"index": {"_id": 1}}
{"num_1": 10, "num_2": 50, "histo": {"values": [1, 2, 3, 4], "counts": [3, 4, 6, 5]}}
{"index": {"_id": 2}}
{"num_1": 20, "num_2": 40, "histo": {"values": [1, 2, 3, 6], "counts": [3, 4, 6, 5]}}
{"index": {"_id": 3}}
{"num_1": 5, "num_2": 60, "histo": {"values": [1, 2, 3, 8], "counts": [3, 4, 6, 5]}}
{"index": {"_id": 4}}
{"num_1": 6, "num_2": 80, "histo": {"values": [1, 2, 3, 5], "counts": [3, 4, 6, 5]}}

GET /max_test/_search
{
  "size": 0,
  "aggs": {
    "max_aggs": {
      "max": {
        "field": "num_1"
      }
    }
  }
}

# 结果
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 4,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "aggregations" : {
    "max_aggs" : {
      "value" : 20.0
    }
  }
}

GET /max_test/_search
{
  "size": 0,
  "aggs": {
    "max_histo_aggs": {
      "max": {
        "field": "histo"
      }
    }
  }
}
# 结果
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 4,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "aggregations" : {
    "max_histo_aggs" : {
      "value" : 8.0
    }
  }
}

GET /max_test/_search
{
  "size": 0,
  "aggs": {
    "max_num_script_aggs": {
      "max": {
        "field": "num_2",
        "script": {
          "lang": "painless", 
          "source": "_value * params.param",
          "params": {
            "param": 10
          }
        }
      }
    }
  }
}

# 结果
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 4,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "aggregations" : {
    "max_num_script_aggs" : {
      "value" : 800.0
    }
  }
}

最后

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