Elasticsearch：存储桶排序聚合+按字母顺序排序

如何解决Elasticsearch：存储桶排序聚合+按字母顺序排序

我正在尝试汇总字段中的数据，并且应该在另一个字段中进行排序。我也想分页，所以我以为可以使用elasticsearch的BucketSort。我遇到了String（字母）字段的问题。

这是我的虚拟数据。

{
    "_index": "testing-aggregation","_type": "employee","_id": "emp001_local000000000000001","_score": 10.0,"_source": {
        "name": [
            "Person 01"
        ],"groupbyid": [
            "group0001"
        ],"ranking": [
             "2.0"
        ]
    }
},{
    "_index": "testing-aggregation","_id": "emp002_local000000000000001","_score": 85146.375,"_source": {
        "name": [
            "Person 02"
        ],"ranking": [
             "10.0"
        ]
    }
},"_id": "emp003_local000000000000001","_score": 20.0,"_source": {
        "name": [
            "Person 03"
        ],"groupbyid": [
            "group0002"
        ],"ranking": [
             "-1.0"
        ]
    }
},"_id": "emp004_local000000000000001","_score": 5.0,"_source": {
        "name": [
            "Person 04"
        ],"ranking": [
             "2.0"
        ]
    }
}

映射以上数据。

{
    "name": {
        "type": "text","fielddata": true,"fields": {
            "lower_case_sort": {
                "type": "text","analyzer": "case_insensitive_sort"
            }
        }
    },"ranking": {
         "type": "float"
    },"groupbyid": {
        "type": "text","index": "analyzed","fields": {
            "raw": {
                "type": "keyword","index": "not_analyzed"
            }
        }
    }
}

ES查询：

{
  "from": 0,"size": 0,"query": {
    "bool": {
      "must": [
        {
          "query_string": {
            "query": "name:XYZ"
          }
        }
      ]
    }
  },"aggregations": {
    "groupbyid": {
      "terms": {
        "field": "groupbyid.raw","size": 100
      },"aggs": {
        "top_hit_agg": {
          "top_hits": {
            "size": 100
          }
        },"ranking_agg": {
            "min": {
                "field": "ranking"
            }
        },"test_bucket_sort": {
          "bucket_sort": {
            "sort": [
              {
                "ranking_agg": {
                  "order": "desc"
                }
              }
            ],"size": 100,"from": 0
          }
        }
      }
    }
  }
}

我能够实现“数字”字段。但是不知道我将如何处理名称字段。一种方法是使用脚本，但是我不想使用这种方法，因为这可能是一项昂贵的操作。

有人可以帮我吗？我正在使用ES 7.7.1。

谢谢， Sharvil Shah

解决方法

如果您想按字母顺序对name字段进行排序，请使用 groupbyid可以用于name.keyword的术语聚合和排序 在键上。

您不能在最小聚合中使用name字段，因为Min aggregation

不支持文本字段

{
  "aggregations": {
    "groupbyname": {
      "terms": {
        "field": "name.keyword","order": { "_key" : "desc" }
      }
    }
  }
}

搜索结果：

"aggregations": {
    "groupbyname": {
      "doc_count_error_upper_bound": 0,"sum_other_doc_count": 0,"buckets": [
        {
          "key": "Person 04","doc_count": 1
        },{
          "key": "Person 03",{
          "key": "Person 01","doc_count": 1
        }
      ]
    }