[英]How to query nested structure in elasticsearch
以下是我的Elasticsearch索引中的兩個模擬記錄。 我的ES中有數百萬條記錄。 我正在嘗試查詢ES以獲取具有非空/非空“標簽”字段的所有記錄。 如果一條記錄沒有標簽(如下面的第二條記錄),那么我不想從ES中提取它。
如果未嵌套“書籍”,那么以下查詢似乎可以正常工作-
curl -XGET 'host:port/book_indx/book/_search?' -d '{
"query" : {"filtered" : {"filter" : {"exists" :{"field" : "_source"}}}}
}'
但是我沒有找到查詢嵌套結構的解決方案。 我沒有運氣就嘗試了以下-
{"query" : {"filtered" : {"filter" : {"exists" :{"field" : "_source.tags"}}}}}
{"query" : {"filtered" : {"filter" : {"exists" :{"field" : "_source":{"tags"}}}}}}
任何建議在這里都非常感謝! 提前致謝。
{
"_shards": {
"failed": 0,
"successful": 12,
"total": 12
},
"hits": {
"hits": [
{
"_id": "book1",
"_index": "book",
"_source": {
"book_name": "How to Get Organized",
"publication_date": "2014-02-24T16:50:39+0000",
"tags": [
{
"category": "self help",
"topics": [
{
"name": "time management",
"page": 6198
},
{
"name": "calendar",
"page": 10
}
],
"id": "WEONWOIR234LI",
}
],
"last_updated": "2015-11-11T16:28:32.308+0000"
},
"_type": "book"
},
{
"_id": "book2",
"_index": "book",
"_source": {
"book_name": "How to Cook",
"publication_date": "2014-02-24T16:50:39+0000",
"tags": [],
"last_updated": "2015-11-11T16:28:32.308+0000"
},
"_type": "book"
}
],
"total": 1
},
"timed_out": false,
"took": 80
}
映射-
"book": {
"_id": {
"path": "message_id"
},
"properties": {
"book_name": {
"index": "not_analyzed",
"type": "string"
},
"publication_date": {
"format": "date_time||date_time_no_millis",
"type": "date"
},
"tags": {
"properties": {
"category": {
"index": "not_analyzed",
"type": "string"
},
"topic": {
"properties": {
"name": {
"index": "not_analyzed",
"type": "string"
},
"page": {
"index": "no",
"type": "integer"
}
}
},
"id": {
"index": "not_analyzed",
"type": "string"
}
},
"type": "nested"
},
"last_updated": {
"format": "date_time||date_time_no_millis",
"type": "date"
}
}
}
由於您的tags
字段具有nested
類型,因此您需要使用nested
過濾器進行查詢。
以下過濾的查詢將僅正確返回上面的第一個文檔(即,具有id book1
)
{
"query": {
"filtered": {
"filter": {
"nested": {
"path": "tags",
"filter": {
"exists": {
"field": "tags"
}
}
}
}
}
}
}
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