使用 ElasticSearch 聚合获取完整文档答案

【问题标题】：Getting full documents using ElasticSearch aggregations使用 ElasticSearch 聚合获取完整文档
【发布时间】：2015-12-10 23:41:58
【问题描述】：

我有一个类似的索引：

[
    {
        "Name": "Alex",
        "LastName": "Ich",
        "Department": 2
    },
    {
        "Name": "Charlie",
        "LastName": "Sheen",
        "Department": 3
    },
    {
        "Name": "Peter",
        "LastName": "Petrelli",
        "Department": 5
    },
    {
        "Name": "Alan",
        "LastName": "Harper",
        "Department": 6
    },
    {
        "Name": "Ann",
        "LastName": "Bottle",
        "Department": 3
    },
]

我想得到具有不同 Department 的结果，我不关心顺序，每个 Department 只需要 1 个结果。我尝试使用 aggregations，但我只能设法获得与 doc_count 关联的不同 Deppartments。他们查询我试过的是这样的：

{
  "aggs": {
    "deppartments": {
      "terms": {
        "field": "Department"
      }
    }
  },"size": 0
}

"buckets": [
    {
        "key": 2,
        "doc_count": 1
    },
    {
        "key": 3,
        "doc_count": 2
    },
    {
        "key": 5,
        "doc_count": 1
    },
    {
        "key": 6,
        "doc_count": 1
    },
]

当我想要类似的东西时：

[
    {
        "Name": "Alex",
        "LastName": "Ich",
        "Department": 2
    },
    {
        "Name": "Charlie",
        "LastName": "Sheen",
        "Department": 3
    },
    {
        "Name": "Peter",
        "LastName": "Petrelli",
        "Department": 5
    },
    {
        "Name": "Alan",
        "LastName": "Harper",
        "Department": 6
    }
]

【问题讨论】：

标签： elasticsearch elasticsearch-aggregation

【解决方案1】：

您可以为此使用Top hits aggregation

{
  "aggs": {
    "departments": {
      "terms": {
        "field": "Department",
        "size": 10
      },
      "aggs": {
        "search_results": {
          "top_hits": {
            "size": 10   <--- you can change the size to 1 if you want
          }
        }
      }
    }
  },
  "size": 0
}

这有帮助吗？

【讨论】：