不错的尝试，您快到了！这是我想出的。根据您的映射建议，我正在使用的映射如下：
curl -XPUT localhost:9200/test/_mapping/test -d '{
"test": {
"properties": {
"keyword": {
"type": "string",
"index": "not_analyzed"
},
"items": {
"type": "nested",
"properties": {
"name": {
"type": "string"
},
"item_property_1": {
"type": "string",
"index": "not_analyzed"
}
}
}
}
}
}'
注意：您需要擦除数据并重新编制索引，因为您无法将字段类型从不是更改nested为nested。
然后，我使用您共享的批量查询创建了一些数据：
curl -XPOST localhost:9200/test/test/_bulk -d '
{ "index": {}}
{ "keyword": "some keyword", "items": [ { "name":"my first item", "item_property_1":"A" }, { "name":"my second item", "item_property_1":"B" }, { "name":"my third item", "item_property_1":"A" } ]}
{ "index": {}}
{ "keyword": "different keyword", "items": [ { "name":"cool item", "item_property_1":"A" }, { "name":"awesome item", "item_property_1":"C" } ]}
'
最后，这是可用于获取期望结果的聚合查询。我们首先keyword使用terms聚合来进行存储，然后针对每个关键字通过嵌套item_property_1字段进行存储。由于items现在是一个nested类型的，关键是用nested聚合的items，然后一个terms子聚集的item_property_1领域。
{
"size": 0,
"aggregations": {
"by_keyword": {
"terms": {
"field": "keyword"
},
"aggs": {
"prop_1_count": {
"nested": {
"path": "items"
},
"aggs": {
"prop_1": {
"terms": {
"field": "items.item_property_1"
}
}
}
}
}
}
}
}
在您的数据集上运行该查询将产生以下结果：
{
...
"aggregations" : {
"by_keyword" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [ {
"key" : "different keyword", <---- keyword 1
"doc_count" : 1,
"prop_1_count" : {
"doc_count" : 2,
"prop_1" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [ { <---- buckets for item_property_1
"key" : "A",
"doc_count" : 1
}, {
"key" : "C",
"doc_count" : 1
} ]
}
}
}, {
"key" : "some keyword", <---- keyword 2
"doc_count" : 1,
"prop_1_count" : {
"doc_count" : 3,
"prop_1" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [ { <---- buckets for item_property_1
"key" : "A",
"doc_count" : 2
}, {
"key" : "B",
"doc_count" : 1
} ]
}
}
} ]
}
}
}
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