ElasticSearch post_filter 和筛选聚合的行为方式不同

Question

我已经花了整整一周的时间解决这个问题，但没有希望解决它。我正在关注这个（很旧）article on e-commerce search and faceted filtering，等等，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。我正在使用 ElasticSearch 6.1.1 .

但是因为我想让我的用户在小平面上执行多个 select 离子，所以我将过滤器移到了 post_filter 部分。 仍然运行良好，它正确过滤结果并准确显示整个文档集的聚合计数。

阅读后，我意识到我必须对 'filtered' 聚合和 'special' 聚合进行一些疯狂的杂技来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。我已经要求对这个问题进行一些澄清，但还没有得到回应（这是一个老问题）。

我长期以来一直在努力解决的问题是在 嵌套字段 上获得一组过滤聚合，其中所有方面都使用所有过滤器进行过滤。

我的计划是使用一般聚合（未过滤）并保持 selected 方面聚合未过滤（这样我可以 select 多个条目）但使用当前过滤所有其他聚合selected facets，这样我只能显示我仍然可以应用的过滤器。

但是，如果我对文档使用 THE SAME 过滤器（效果很好），并将过滤器放在过滤后的聚合中，它们将无法按预期工作。计数都是错误的。我知道聚合是在过滤器之前计算的，这就是为什么我要在我想要的聚合上复制过滤器。

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，效果很好并且 returns 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（在本例中显示了“13”个结果，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），return 所有产品的所有方面都有正确的计数：

    "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！对于与我的查询匹配的所有文档，我看到所有具有准确分面计数的聚合。

现在，检查一下：我正在为相同的嵌套字段创建聚合但进行了过滤，以便我可以获得 'survive' 我的过滤器的聚合 + 方面：

"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与首先过滤我的结果的过滤器相同（在post中）。

但由于某种原因，聚合 returned 都是错误的，即 facet 计数。例如，在我在这里的搜索中，我得到了 13 个结果，但是来自“agg_all_facets_filtered”的聚合 return 的计数只有：'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“Cover colour”方面：一次用于 'Green'，一次用于 'Some other colours' ...所以我的聚合似乎只计算具有该方面名称 TWICE 的条目 - 或者与其他文档相同。这就是为什么我认为我对聚合的过滤是错误的。我已经阅读了很多关于 matching/filters 的 AND 与 OR 的阅读资料，我尝试使用 'Filter'、'Should' 等。没有什么可以解决这个问题。

很抱歉这是一个很长的问题但是：

我如何编写聚合过滤器，以便 returned 具有正确的计数，因为我的过滤器本身可以完美运行？

非常感谢大家。

更新：例如，根据请求，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" }
                    }
                  }
                }
            }  
         }

       }


    }

  }
}

returned 结果是正确的（就文档而言），这里是聚合（未过滤，来自结果，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
                }
              ]
            }
          }

这里是聚合（使用相同的过滤器过滤，同时来自 'agg_all_facets_filtered'），仅显示 'Green' 的 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
                  }
                ]
              }
            }

更新 2：这里有一些示例文档 return 由查询编辑：

"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

谜底揭晓！感谢您的输入，原来我使用的版本（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，或者干脆留下它，因为它是旧版本并且他们已经移动了。

ElasticSearch post_filter 和筛选聚合的行为方式不同

ElasticSearch post_filter and filtered aggregations not behaving the same way

elasticsearch

search

filter

facet