[英]How to filter nested aggregations in ElasticSearch?
例如,假设我们有一个具有以下映射的产品索引:
{
"product": {
"mappings": {
"producttype": {
"properties": {
"id": {
"type": "keyword"
},
"productAttributes": {
"type": "nested",
"properties": {
"name": {
"type": "keyword"
},
"value": {
"type": "keyword"
}
}
},
"title": {
"type": "text",
"fields": {
"keyword": {
"type": "text",
"analyzer": "keyword"
}
},
"analyzer": "standard"
}
}
}
}
}
}
我正在尝试使用以下查询查找有多少具有特定产品属性的产品(我使用模糊查询来允许一些编辑距离):
{
"size": 0,
"query": {
"nested": {
"query": {
"fuzzy": {
"productAttributes.name": {
"value": "SSD"
}
}
},
"path": "productAttributes"
}
},
"aggs": {
"product_attribute_nested_agg": {
"nested": {
"path": "productAttributes"
},
"aggs": {
"terms_nested_agg": {
"terms": {
"field": "productAttributes.name"
}
}
}
}
}
}
但它会返回每个匹配文档的所有产品属性,这是我得到的响应。
"aggregations" : {
"product_attribute_nested_agg" : {
"doc_count" : 6,
"terms_nested_agg" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "SSD",
"doc_count" : 3
},
{
"key" : "USB 2.0",
"doc_count" : 3
}
]
}
}
}
您能否指导我如何过滤存储桶以仅返回匹配的属性?
编辑:以下是一些文档示例:
"hits" : {
"total" : 12,
"max_score" : 1.0,
"hits" : [
{
"_index" : "product",
"_type" : "producttype",
"_id" : "677d1164-c401-4d36-8a08-6aa14f7f32bb",
"_score" : 1.0,
"_source" : {
"title" : "Dell laptop",
"productAttributes" : [
{
"name" : "USB 2.0",
"value" : "4"
},
{
"name" : "SSD",
"value" : "250 GB"
}
]
}
},
{
"_index" : "product",
"_type" : "producttype",
"_id" : "2954935a-7f60-437a-8a54-00da2d71da46",
"_score" : 1.0,
"_source" : {
"productAttributes" : [
{
"name" : "USB 2.0",
"value" : "3"
},
{
"name" : "SSD",
"value" : "500 GB"
}
],
"title" : "HP laptop"
}
},
]
}
要仅过滤特定内容,您可以使用filter
查询。
询问:
{
"size": 0,
"aggs": {
"product_attribute_nested_agg": {
"nested": {
"path": "productAttributes"
},
"aggs": {
"inner": {
"filter": {
"terms": {
"productAttributes.name": [
"SSD"
]
}
},
"aggs": {
"terms_nested_agg": {
"terms": {
"field": "productAttributes.name"
}
}
}
}
}
}
}
}
这就是它的诀窍:
"filter": {
"terms": {
"productAttributes.name": [
"SSD"
]
}
}
您需要过滤聚合的一部分。
Output:
"aggregations": {
"product_attribute_nested_agg": {
"doc_count": 4,
"inner": {
"doc_count": 2,
"terms_nested_agg": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
{
"key": "SSD",
"doc_count": 2
}
]
}
}
}
}
使用模糊过滤:
GET /product/_search
{
"size": 0,
"aggs": {
"product_attribute_nested_agg": {
"nested": {
"path": "productAttributes"
},
"aggs": {
"inner": {
"filter": {
"fuzzy": {
"productAttributes.name": {
"value": "SSt",//here will match SSD
"fuzziness": 3//you can remove it to be as Auto
}
}
},
"aggs": {
"terms_nested_agg": {
"terms": {
"field": "productAttributes.name"
}
}
}
}
}
}
}
}
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