ElasticSearch post_filter 和过滤聚合的行为不同

Question

我已经花了整整一周的时间来解决这个问题，但没有希望解决它。我正在关注这个(很老)article on e-commerce search and faceted filtering等，到目前为止它运行良好(搜索结果很好，当在查询中应用过滤器时聚合效果很好。我使用的是 ElasticSearch 6.1.1。

但是因为我想让我的用户在构面上执行多项选择，所以我将过滤器移到了 post_filter 部分。此 仍然运行良好 ，它会正确过滤结果并准确显示整个文档集的聚合计数。

阅读后this question on StackOverflow ，我意识到我必须使用“过滤”聚合和“特殊”聚合来执行一些疯狂的杂技，以相互修剪聚合以显示正确的计数并允许同时使用多个过滤器。我已经要求对该问题进行一些澄清，但尚未得到答复(这是一个老问题)。

我一直在努力解决的问题是在 上获得一组过滤聚合。嵌套字段 其中所有方面都用所有过滤器过滤。

我的计划是使用一般聚合(未过滤)并保持选定的方面聚合未过滤(以便我可以选择多个条目)但使用当前选择的方面过滤所有其他聚合，以便我只能显示我仍然可以的过滤器申请。

但是，如果我在文档上使用相同的过滤器(工作正常)，并将过滤器放入过滤后的聚合中，它们将无法按预期工作。计数全错了。我知道聚合是在过滤器之前计算的，这就是我在我想要的聚合上复制过滤器的原因。

这是我的查询:

  "query": {
    "bool": {
      "must": [
        {
          "multi_match": {
            "fields": [
              "search_data.full_text_boosted^7",
              "search_data.full_text^2"
            ],
            "type": "cross_fields",
            "analyzer": "full_text_search_analyzer",
            "query": "some book"
          }
        }
      ]
    }
  }

这里没什么特别的，它运行良好并返回相关结果。

这是我的过滤器(在 post_filter 中):

"post_filter" : {
    "bool" : {
      "must" : [
      {
        "nested": {
          "path": "string_facets",
            "query": {
              "bool" : {
                "filter" : 
                [
                  { "term" : { "string_facets.facet_name" : "Cover colour" } },
                  { "terms" : { "string_facets.facet_value" : [ "Green" ] } }
                ]
              }
            }
          }
        }

      ]
    }
  }

让我强调一下: 这很好用 .我看到了正确的结果(在这种情况下，显示了 '13' 结果，所有结果都匹配正确的字段 - 'Cover colour' = 'Green' )。

这是我的一般(未过滤的聚合)，它返回所有产品的所有方面的正确计数:

    "agg_string_facets": {
  "nested": {
    "path": "string_facets"
  },
  "aggregations": {
      "facet_name": {
        "terms": {
          "field": "string_facets.facet_name"
        },
        "aggregations": {
          "facet_value": {
            "terms": {
              "field": "string_facets.facet_value"
            }
          }
        }
      }
  }
}

这也很完美 !我看到了所有与我的查询匹配的文档的准确方面计数的所有聚合。

现在，检查一下:我正在为相同的嵌套字段创建聚合，但已过滤，以便我可以获得“幸存”我的过滤器的聚合 + 构面:

"agg_all_facets_filtered" : {

           "filter" : {
             "bool" : {
               "must" : [
                {
                   "nested": {
                     "path": "string_facets",
                     "query": {
                       "bool" : {
                         "filter" : [
                           { "term" : { "string_facets.facet_name" : "Cover colour" } },
                           { "terms" : { "string_facets.facet_value" : [ "Green" ] } }
                          ]
                       }
                    }
                  }
              }]
            }
        },
        "aggs" : {
         "agg_all_facets_filtered" : {
           "nested": { "path": "string_facets" },
           "aggregations": {
            "facet_name": {
              "terms": { "field": "string_facets.facet_name" },
              "aggregations": {
                    "facet_value": {
                      "terms": { "field": "string_facets.facet_value" }
                    }
                  }
                }
            }  
         }

       }

请注意我在此聚合中使用的过滤器是 与首先过滤我的结果的相同 (在帖子中)。

但是由于某种原因，返回的聚合都是错误的，即刻面计数。例如，在我在这里的搜索中，我得到了 13 个结果，但从 'agg_all_facets_filtered' 返回的聚合只有一个计数:'Cover colour' = 4。

{
  "key": "Cover colour",
  "doc_count": 4,
  "facet_value": {
    "doc_count_error_upper_bound": 0,
    "sum_other_doc_count": 0,
    "buckets": [
        {
          "key": "Green",
          "doc_count": 4
        }
    ]
  }
}

在检查了为什么 4 之后，我注意到其中 3 个文档包含两次“封面颜色”方面:一次是“绿色”，一次是“其他颜色”……所以我的聚合似乎只计算具有该颜色的条目分面名称 TWICE - 或与其他文档相同。这就是为什么我认为我对聚合的过滤器是错误的。我已经阅读了很多关于匹配/过滤器的 AND 与 OR 的阅读，我尝试过“过滤器”、“应该”等。没有什么能解决这个问题。

很抱歉，这是一个很长的问题，但是:

考虑到我的过滤器本身可以完美运行，我如何编写聚合过滤器以便返回的构面具有正确的计数？

非常感谢大家。

更新:例如以下请求，这是我的完整查询(请注意 post_filter 中的过滤器以及过滤聚合中的相同过滤器):

{
  "size" : 0,
  "query": {
    "bool": {
      "must": [
        {
          "multi_match": {
            "fields": [
              "search_data.full_text_boosted^7",
              "search_data.full_text^2"
            ],
            "type": "cross_fields",
            "analyzer": "full_text_search_analyzer",
            "query": "bible"
          }
        }
      ]
    }
  },

  "post_filter" : {

    "bool" : {
      "must" : [
      {
        "nested": {
          "path": "string_facets",
            "query": {
              "bool" : {
                "filter" : 
                [
                  { "term" : { "string_facets.facet_name" : "Cover colour" } },
                  { "terms" : { "string_facets.facet_value" : [ "Green" ] } }
                ]
              }
            }
          }
        }

      ]
    }

  },

  "aggregations": {

        "agg_string_facets": {
      "nested": {
        "path": "string_facets"
      },
      "aggregations": {
          "facet_name": {
            "terms": {
              "field": "string_facets.facet_name"
            },
            "aggregations": {
              "facet_value": {
                "terms": {
                  "field": "string_facets.facet_value"
                }
              }
            }
          }
      }
    },

    "agg_all_facets_filtered" : {

           "filter" : {
             "bool" : {
               "must" : [
                {
                   "nested": {
                     "path": "string_facets",
                     "query": {
                       "bool" : {
                         "filter" : [
                           { "term" : { "string_facets.facet_name" : "Cover colour" } },
                           { "terms" : { "string_facets.facet_value" : [ "Green" ] } }
                          ]
                       }
                    }
                  }
              }]
            }
        },
        "aggs" : {
         "agg_all_facets_filtered" : {
           "nested": { "path": "string_facets" },
           "aggregations": {
            "facet_name": {
              "terms": { "field": "string_facets.facet_name" },
              "aggregations": {
                    "facet_value": {
                      "terms": { "field": "string_facets.facet_value" }
                    }
                  }
                }
            }  
         }

       }


    }

  }
}

返回的结果是正确的(就文档而言)，这里是聚合(未过滤，从结果中，对于 'agg_string_facets' - 注意 'Green' 显示 13 个文档 - 这是正确的):

{
            "key": "Cover colour",
            "doc_count": 483,
            "facet_value": {
              "doc_count_error_upper_bound": 0,
              "sum_other_doc_count": 111,
              "buckets": [
                {
                  "key": "Black",
                  "doc_count": 87
                },
                {
                  "key": "Brown",
                  "doc_count": 75
                },
                {
                  "key": "Blue",
                  "doc_count": 45
                },
                {
                  "key": "Burgundy",
                  "doc_count": 43
                },
                {
                  "key": "Pink",
                  "doc_count": 30
                },
                {
                  "key": "Teal",
                  "doc_count": 27
                },
                {
                  "key": "Tan",
                  "doc_count": 20
                },
                {
                  "key": "White",
                  "doc_count": 18
                },
                {
                  "key": "Chocolate",
                  "doc_count": 14
                },
                {
                  "key": "Green",
                  "doc_count": 13
                }
              ]
            }
          }

这是聚合(使用相同的过滤器过滤，同时来自 'agg_all_facets_filtered')，仅显示 4 的 'Green':

{
              "key": "Cover colour",
              "doc_count": 4,
              "facet_value": {
                "doc_count_error_upper_bound": 0,
                "sum_other_doc_count": 0,
                "buckets": [
                  {
                    "key": "Green",
                    "doc_count": 4
                  }
                ]
              }
            }

更新 2:以下是查询返回的一些示例文档:

"hits": {
    "total": 13,
    "max_score": 17.478987,
    "hits": [
      {
        "_index": "redacted",
        "_type": "product",
        "_id": "33107",
        "_score": 17.478987,
        "_source": {
          "type": "product",
          "document_id": 33107,
          "search_data": {
            "full_text": "hcsb compact ultrathin bible mint green leathertouch  holman bible staff leather binding 9781433617751 ",
            "full_text_boosted": "HCSB Compact Ultrathin Bible Mint Green Leathertouch Holman Bible Staff "
          },
          "search_result_data": {
            "name": "HCSB Compact Ultrathin Bible, Mint Green Leathertouch (Leather)",
            "preview_image": "/images/products/medium/0.jpg",
            "url": "/Products/ViewOne.aspx?ProductId=33107"
          },
          "string_facets": [
            {
              "facet_name": "Binding",
              "facet_value": "Leather"
            },
            {
              "facet_name": "Bible size",
              "facet_value": "Compact"
            },
            {
              "facet_name": "Bible size",
              "facet_value": "Ultrathin"
            },
            {
              "facet_name": "Bible version",
              "facet_value": "HCSB"
            },
            {
              "facet_name": "Cover colour",
              "facet_value": "Green"
            }
          ]
        }
      },
      {
        "_index": "redacted",
        "_type": "product",
        "_id": "17240",
        "_score": 17.416323,
        "_source": {
          "type": "product",
          "document_id": 17240,
          "search_data": {
            "full_text": "kjv thinline bible compact  leather binding 9780310439189 ",
            "full_text_boosted": "KJV Thinline Bible Compact "
          },
          "search_result_data": {
            "name": "KJV Thinline Bible, Compact (Leather)",
            "preview_image": "/images/products/medium/17240.jpg",
            "url": "/Products/ViewOne.aspx?ProductId=17240"
          },
          "string_facets": [
            {
              "facet_name": "Binding",
              "facet_value": "Leather"
            },
            {
              "facet_name": "Bible size",
              "facet_value": "Compact"
            },
            {
              "facet_name": "Bible size",
              "facet_value": "Thinline"
            },
            {
              "facet_name": "Bible version",
              "facet_value": "KJV"
            },
            {
              "facet_name": "Cover colour",
              "facet_value": "Green"
            }
          ]
        }
      },
      {
        "_index": "redacted",
        "_type": "product",
        "_id": "17243",
        "_score": 17.416323,
        "_source": {
          "type": "product",
          "document_id": 17243,
          "search_data": {
            "full_text": "kjv busy mom's bible  leather binding 9780310439134 ",
            "full_text_boosted": "KJV Busy Mom'S Bible "
          },
          "search_result_data": {
            "name": "KJV Busy Mom's Bible (Leather)",
            "preview_image": "/images/products/medium/17243.jpg",
            "url": "/Products/ViewOne.aspx?ProductId=17243"
          },
          "string_facets": [
            {
              "facet_name": "Binding",
              "facet_value": "Leather"
            },
            {
              "facet_name": "Bible size",
              "facet_value": "Pocket"
            },
            {
              "facet_name": "Bible size",
              "facet_value": "Thinline"
            },
            {
              "facet_name": "Bible version",
              "facet_value": "KJV"
            },
            {
              "facet_name": "Cover colour",
              "facet_value": "Pink"
            },
            {
              "facet_name": "Cover colour",
              "facet_value": "Green"
            }
          ]
        }
      },
      {
        "_index": "redacted",
        "_type": "product",
        "_id": "33030",
        "_score": 15.674053,
        "_source": {
          "type": "product",
          "document_id": 33030,
          "search_data": {
            "full_text": "apologetics study bible for students grass green leathertou  mcdowell sean; holman bible s leather binding 9781433617720 ",
            "full_text_boosted": "Apologetics Study Bible For Students Grass Green Leathertou Mcdowell Sean; Holman Bible S"
          },
          "search_result_data": {
            "name": "Apologetics Study Bible For Students, Grass Green Leathertou (Leather)",
            "preview_image": "/images/products/medium/33030.jpg",
            "url": "/Products/ViewOne.aspx?ProductId=33030"
          },
          "string_facets": [
            {
              "facet_name": "Binding",
              "facet_value": "Leather"
            },
            {
              "facet_name": "Bible designation",
              "facet_value": "Study Bible"
            },
            {
              "facet_name": "Bible designation",
              "facet_value": "Students"
            },
            {
              "facet_name": "Bible feature",
              "facet_value": "Indexed"
            },
            {
              "facet_name": "Cover colour",
              "facet_value": "Green"
            }
          ]
        }
      },
      {
        "_index": "redacted",
        "_type": "product",
        "_id": "33497",
        "_score": 15.674053,
        "_source": {
          "type": "product",
          "document_id": 33497,
          "search_data": {
            "full_text": "hcsb life essentials study bible brown / green  getz gene a.; holman bible st imitation leather 9781586400446 ",
            "full_text_boosted": "HCSB Life Essentials Study Bible Brown  Green Getz Gene A ; Holman Bible St"
          },
          "search_result_data": {
            "name": "HCSB Life Essentials Study Bible Brown / Green (Imitation Leather)",
            "preview_image": "/images/products/medium/33497.jpg",
            "url": "/Products/ViewOne.aspx?ProductId=33497"
          },
          "string_facets": [
            {
              "facet_name": "Binding",
              "facet_value": "Imitation Leather"
            },
            {
              "facet_name": "Bible designation",
              "facet_value": "Study Bible"
            },
            {
              "facet_name": "Bible version",
              "facet_value": "HCSB"
            },
            {
              "facet_name": "Binding",
              "facet_value": "Imitation leather"
            },
            {
              "facet_name": "Cover colour",
              "facet_value": "Brown"
            },
            {
              "facet_name": "Cover colour",
              "facet_value": "Green"
            }
          ]
        }
      }
}

Answer 1

谜团已揭开!感谢您的输入，事实证明我使用的版本(6.1.1)有一个错误。我不知道错误到底是什么，但我已经安装了 ElasticSearch 6.5，重新索引了我的数据并且没有更改查询或映射，一切正常!

现在，我不知道我是否应该向 ES 提交错误报告，或者只是留下它，因为它是一个较旧的版本并且他们已经继续前进。