elasticsearch - Elasticsearch中的过滤器/查询支持

Question

Elasticsearch文档指出The top_hits aggregation returns regular search hits, because of this many per hit features can be supported最重要的是，该列表包括Named filters and queries
但是尝试添加任何过滤器或查询会抛出SearchParseException: Unknown key for a START_OBJECT
用例:我有带有嵌套注释列表的项目

项目{id}->评论{日期，评分}

我想在上周获得每个项目的最高评价。

{
 "query": {
   "match_all": {}
  },
  "aggs": {
    "items": {
      "terms": {
        "field": "id",
        "size": 10
      },
      "aggs": {
        "comment": {
          "nested": {
            "path": "comments"
          },
          "aggs": {
            "top_comment": {
              "top_hits": {
                "size": 1,
                //need filter  here to select only comments of last week
                "sort": {
                  "comments.rating": {
                    "order": "desc"
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

那么文档是否错误，或者有什么方法可以添加过滤器？

https://www.elastic.co/guide/en/elasticsearch/reference/2.1/search-aggregations-metrics-top-hits-aggregation.html

Answer 1

您确定已将它们映射为Nested吗？我只是试图对我的数据执行这样的查询，它确实工作正常。

如果是这样，您可以在嵌套聚合之后添加一个过滤器聚合(希望我没有弄乱大括号):

POST data/_search
{
  "size": 0,
  "query": {
    "filtered": {
      "query": {
        "match_all": {}
      },
      "filter": {
        "nested": {
          "path": "comments",
          "query": {
            "range": {
              "comments.date": {
                "gte": "now-1w",
                "lte": "now"
              }
            }
          }
        }
      }
    }
  },
  "aggs": {
    "items": {
      "terms": {
        "field": "id",
        "size": 10
      },
      "aggs": {
        "nested": {
          "nested": {
            "path": "comments"
          },
          "aggs": {
            "filterComments": {
              "filter": {
                "range": {
                  "comments.date": {
                    "gte": "now-1w",
                    "lte": "now"
                  }
                }
              },
              "aggs": {
                "topComments": {
                  "top_hits": {
                    "size": 1,
                    "sort": {
                      "comments.rating": "desc"
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

附言始终为嵌套对象包括FULL路径。

因此，此查询将:

过滤注释少于一周的文档，以缩小文档范围以进行汇总并查找那些实际上具有此类注释的文档(过滤查询)

基于id字段

进行术语聚合

打开嵌套的子文档(注释)

按日期过滤它们

返回最糟糕的一个(评分最高)