elasticsearch中的排序聚合？

Question

我有一个用例，我需要从 Elasticsearch 获取所有唯一的用户 ID，并且它应该按时间戳排序。

我目前使用的是带有子聚合的复合术语聚合，它将返回最新的时间戳。

（我无法在客户端对其进行排序，因为它会减慢脚本速度）

弹性搜索中的样本数据

{
  "_index": "logstash-2020.10.29",
  "_type": "doc",
  "_id": "L0Urc3UBttS_uoEtubDk",
  "_version": 1,
  "_score": null,
  "_source": {
    "@version": "1",
    "@timestamp": "2020-10-29T06:56:00.000Z",
    "timestamp_string": "1603954560",
    "search_query": "example 3",
    "user_uuid": "asdfrghcwehf",
    "browsing_url": "https://www.google.com/search?q=example+3",
  },
  "fields": {
    "@timestamp": [
      "2020-10-29T06:56:00.000Z"
    ]
  },
  "sort": [
    1603954560000
  ]
}

预期输出：

[
        {
          "key" : "bjvexyducsls",
          "doc_count" : 846,
          "1" : {
            "value" : 1.603948557E12,
            "value_as_string" : "2020-10-29T05:15:57.000Z"
          }
        },
        {
          "key" : "lhmsbq2osski",
          "doc_count" : 420,
          "1" : {
            "value" : 1.6039476E12,
            "value_as_string" : "2020-10-29T05:00:00.000Z"
          }
        },
        {
          "key" : "m2wiaufcbvvi",
          "doc_count" : 1,
          "1" : {
            "value" : 1.603893635E12,
            "value_as_string" : "2020-10-28T14:00:35.000Z"
          }
        },
        {
          "key" : "rrm3vd5ovqwg",
          "doc_count" : 1,
          "1" : {
            "value" : 1.60389362E12,
            "value_as_string" : "2020-10-28T14:00:20.000Z"
          }
        },
        {
          "key" : "x42lk4t3frfc",
          "doc_count" : 72,
          "1" : {
            "value" : 1.60389318E12,
            "value_as_string" : "2020-10-28T13:53:00.000Z"
          }
        }
      ]

Answer 1

添加一个包含索引数据、映射、搜索查询和搜索结果的工作示例

索引映射：

{
  "mappings":{
    "properties":{
      "user":{
        "type":"keyword"
      },
      "date":{
        "type":"date"
      }
    }
  }
}

索引数据：

{
  "date": "2015-01-01",
  "user": "user1"
}
{
  "date": "2014-01-01",
  "user": "user2"
}
{
  "date": "2015-01-11",
  "user": "user3"
}

搜索查询：

{
  "size": 0,
  "aggs": {
    "user_id": {
      "terms": {
        "field": "user",
        "order": {
          "sort_user": "asc"
        }
      },
      "aggs": {
        "sort_user": {
          "min": {
            "field": "date"
          }
        }
      }
    }
  }
}

搜索结果：

"aggregations": {
    "user_id": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "user2",
          "doc_count": 1,
          "sort_user": {
            "value": 1.3885344E12,
            "value_as_string": "2014-01-01T00:00:00.000Z"
          }
        },
        {
          "key": "user1",
          "doc_count": 1,
          "sort_user": {
            "value": 1.4200704E12,
            "value_as_string": "2015-01-01T00:00:00.000Z"
          }
        },
        {
          "key": "user3",
          "doc_count": 1,
          "sort_user": {
            "value": 1.4209344E12,
            "value_as_string": "2015-01-11T00:00:00.000Z"
          }
        }
      ]
    }