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[英]In ElasticSearch ver_6.2.4, how large can scroll_size be?
[英]how to search child documents with the same parent id in Elasticsearch on ver_6.2.4?
從Elasticsearch 6.x開始,將父/子作為單獨類型存儲已替換為join
數據類型 。 這從根本上不會改變索引和查詢這些文檔的方式,但是會稍微改變語法。
注意:這組更改是為完全刪除type
而准備的,這在7.x中發生
除了指定不同的類型,我們將創建一個join
指定字段branch_join
的所有文件。 relations
配置指定了父級->子級關系,鍵( branch
)為父級,值( employee
)為子級。
注意:為了示例,我使用名為organization
的索引
PUT _template/org_template
{
"index_patterns": ["organization"],
"settings": {
"number_of_shards": 2
},
"mappings": {
"_doc": {
"properties": {
"branch_join": {
"type": "join",
"relations": {
"branch": "employee"
}
}
}
}
}
}
索引父文檔是相似的,但是我們需要通過在branch_join
字段中指定branch
來指定每個文檔位於關系的哪一側。
POST /organization/_doc/_bulk
{"index": {"_id": "london"}}
{"name": "London Westminster", "city": "London", "country": "UK", "branch_join": {"name":"branch"}}
{"index": {"_id": "liverpool"}}
{"name": "Liverpool Central", "city": "Liverpool", "country": "UK", "branch_join": {"name":"branch"}}
{"index": {"_id": "paris"}}
{"name": "Champs Élysées", "city": "Paris", "country": "France", "branch_join": {"name":"branch"}}
要為子級建立索引,我們需要做兩件事:1.我們需要再次指定branch_join
字段,不僅要指定連接的哪一側是( employee
),還需要指定父級的_id
要加入的文件。 2.為了確保子代與父代在同一分片上建立索引,我們將routing
參數設置為等於父代文檔的_id
。
POST /organization/_doc/_bulk
{"index": { "_id": 1, "routing": "london"}}
{"name": "Alice Smith", "dob": "1970-10-24", "hobby": "hiking", "branch_join": {"name":"employee", "parent": "london"}}
{"index": { "_id": 2, "routing": "london"}}
{"name": "Mark Thomas", "dob": "1982-05-16", "hobby": "diving", "branch_join": {"name":"employee", "parent": "london"}}
{"index": { "_id": 3, "routing": "liverpool"}}
{"name": "Barry Smith", "dob": "1979-04-01", "hobby": "hiking", "branch_join": {"name":"employee", "parent": "liverpool"}}
{"index": { "_id": 4, "routing": "paris"}}
{"name": "Adrien Grand", "dob": "1987-05-11", "hobby": "horses", "branch_join": {"name":"employee", "parent": "paris"}}
該查詢幾乎是相同的,只是type
已更名為parent_type
以便更明確:
POST /organization/_search
{
"query": {
"has_parent": {
"parent_type": "branch",
"query": {
"ids": {
"values" : ["london"]
}
}
}
}
}
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