【发布时间】：2019-05-22 03:31:20
【问题描述】：
我已经花了整整一周的时间来解决这个问题。我正在关注这个（相当老的）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工作很好。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。这仍然运行良好，它可以正确过滤结果并准确显示整个文档集的聚合计数。
阅读this question on StackOverflow 后，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多个过滤器在同时。我已经要求对这个问题进行一些澄清，但还没有回应（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。
我的计划是使用常规聚合（未过滤）并保持所选方面聚合不过滤（以便我可以选择多个条目）但使用当前选定的方面过滤所有其他聚合，以便我只能显示过滤器我仍然可以申请。
但是，如果我在文档上使用相同的过滤器（效果很好），并将过滤器放在过滤后的聚合中，它们就不会按预期工作。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以及正确的计数：
"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，我看到了具有准确构面计数的所有聚合。
现在，检查一下：我正在为相同的嵌套字段创建一个聚合，但经过过滤，以便我可以获得“存活”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（在帖子中）。
但是由于某种原因，返回的聚合都是错误的，即构面计数。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 个文档包含两个方面“封面颜色”：一次是“绿色”，一次是“其他颜色”......所以看起来我的聚合仅计算具有该构面名称 TWICE 的条目 - 或与其他文档有共同之处。这就是为什么我认为我对聚合的过滤器是错误的。我对匹配/过滤器的 AND 与 OR 进行了大量阅读，我尝试使用“过滤器”、“应该”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，以便返回的构面具有正确的计数，因为我的过滤器本身就可以完美运行？
非常感谢。
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
}
]
}
}
这里是聚合（用相同的过滤器过滤，同时来自'agg_all_facets_filtered'），只显示4个'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"
}
]
}
}
}
【问题讨论】：
-
您能否使用示例文档详细解释当前结果与预期结果。
-
嗨，我已经用示例更新了这个问题。谢谢！
-
我希望您添加的是这 13 个文档中的一些文档。
-
抱歉，虽然您想查看聚合样本。我添加了一些返回的文件。
-
我使用您添加到问题中的五个文档创建了一个示例数据。我又添加了一份与后置过滤器不匹配的文档。在嵌套聚合中，我得到了正确的结果，即
{"key":"Cover colour","doc_count":7,"facet_value":{"doc_count_error_upper_bound":0,"sum_other_doc_count":0,"buckets":[{"key":"Green","doc_count":5},{"key":"Brown","doc_count":1},{"key":"Pink","doc_count":1}]}}
标签： elasticsearch search filter facet