java Elasticsearch聚合查询

Question

我在elasticsearch中存储了一组文档，它们看起来像这样：

{
  "id": "12312312",
  "timestamp": "2015-11-01T00:00:00.000",
  "unit": {
    "id": "123456",
    "name": "unit-4"
  },
  "samples": [
    {
      "value": 244.05435180062133,
      "aggregation": "M",
      "type": {
        "name": "SomeName1",
        "display": "Some name 1"
      }
    },
    {
      "value": 251.19450064653438,
      "aggregation": "I",
      "type": {
        "name": "SomeName2",
        "display": "Some name 2"
      }
    },
    ...
  ]
}

我想对它运行一个聚合查询，它将返回属性samples.value的每个存储桶的unit.id计数， 查询应该基于samples.type.name和samples.aggregation。我制作了这样的东西：

{
  "query": {
    "bool": {
      "must": [{
        "range": {
          "timestamp": {
            "gte": "2015-11-01T00:00:00.000",
            "lte": "2015-11-30T23:59:59.999",
            "format": "date_hour_minute_second_fraction"
          }
        }
      }, {
        "nested": {
          "path": "samples",
          "query": {
            "bool": {
              "must": [{
                "match": {
                  "samples.type.name": "SomeName1"
                }
              }]
            }
          }
        }
      }]
    }
  },
  "aggs": {
    "0": {
      "nested": {
        "path": "samples"
      },
      "aggs": {
        "1": {
          "histogram": {
            "field": "samples.value",
            "interval": 10
          }
        }
      }
    }
  }
}

我在询问http://localhost:9200/dc/sample/_search?search_type=count&pretty。但这会返回samples数组中嵌套文档的计数。 但我需要计算每个桶的不同unit.id

你们能帮帮我吗

编辑：添加了映射

{
  "dc" : {
    "mappings" : {
      "sample" : {
        "unit" : {
          "properties" : {
            "name" : {
              "type" : "string"
            }}},
        "samples" : {
          "type" : "nested",
          "properties" : {
            "aggregation" : {
              "type" : "string"
            },
            "type" : {
              "properties" : {
                "display" : {
                  "type" : "string"
                },
                "name" : {
                  "type" : "string"
                }
              }
            },
            "value" : {
              "type" : "double"
            }
          }
        },
        "timestamp" : {
          "type" : "date",
          "format" : "strict_date_optional_time||epoch_millis"
        }}}}}
}

编辑 我会试着换个说法。。。我想得到“直方图样本值”定义的每个桶的单位数。这意味着这些计数的总和应该是单元的总数。为了测试它，我编写了一个查询，它只过滤一个单元（许多具有不同样本值的文档）——除了一个“直方图样本值”存储桶外，所有存储桶都应该包含count=0，一个存储桶应该包含count=1