[英]Sort nested object in Elasticsearch
我正在使用以下映射:
PUT /my_index
{
"mappings": {
"blogpost": {
"properties": {
"title": {"type": "string"}
"comments": {
"type": "nested",
"properties": {
"comment": { "type": "string" },
"date": { "type": "date" }
}
}
}
}
}
}
文件示例:
PUT /my_index/blogpost/1
{
"title": "Nest eggs",
"comments": [
{
"comment": "Great article",
"date": "2014-09-01"
},
{
"comment": "More like this please",
"date": "2014-10-22"
},
{
"comment": "Visit my website",
"date": "2014-07-02"
},
{
"comment": "Awesome",
"date": "2014-08-23"
}
]
}
我的問題是如何檢索此文檔並按“日期”對嵌套對象“注釋”進行排序? 結果:
PUT /my_index/blogpost/1
{
"title": "Nest eggs",
"comments": [
{
"comment": "Awesome",
"date": "2014-07-23"
},
{
"comment": "Visit my website",
"date": "2014-08-02"
},
{
"comment": "Great article",
"date": "2014-09-01"
},
{
"comment": "More like this please",
"date": "2014-10-22"
}
]
}
你需要sort
的inner_hits到排序nested objects
。 這將為您提供所需的輸出
GET my_index/_search
{
"query": {
"nested": {
"path": "comments",
"query": {
"match_all": {}
},
"inner_hits": {
"sort": {
"comments.date": {
"order": "asc"
}
},
"size": 5
}
}
},
"_source": [
"title"
]
}
我使用的源過濾只得到"title"
的comments
將內檢索inner_hit
但你能避免,如果你想
size
為5,因為默認值為3,並且在給定示例中我們有4個對象。
希望這可以幫助!
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