1.概述

官方文檔

https://www.elastic.co/guide/en/elasticsearch/reference/current/joining-queries.html

兩種類型的查詢

嵌套查詢

has_child和has_parent

其中，has_child返回包含特定查詢字段文檔的父文檔;

has_parent返回包含特定查詢字段的父文檔的子文檔。

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2.實例

2.1 嵌套查詢

GET /_search {"query": {"nested" : {"path" : "obj1","score_mode" : "avg","query" : {"bool" : {"must" : [{ "match" : {"obj1.name" : "blue"} },{ "range" : {"obj1.count" : {"gt" : 5}} }]}}}} }

2.2?has_child?查詢

GET /_search {"query": {"has_child" : {"type" : "blog_tag","query" : {"term" : {"tag" : "something"}}}} }

2.3?has_parent?

GET /_search {"query": {"has_parent" : {"parent_type" : "blog","query" : {"term" : {"tag" : "something"}}}} }

2.4?parent_id?查詢

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PUT my_index {"mappings": {"_doc": {"properties": {"my_join_field": {"type": "join","relations": {"my_parent": "my_child"}}}}} }PUT my_index/_doc/1?refresh {"text": "This is a parent document","my_join_field": "my_parent" }PUT my_index/_doc/2?routing=1&refresh {"text": "This is a child document","my_join_field": {"name": "my_child","parent": "1"} }

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GET /my_index/_search {"query": {"parent_id": {"type": "my_child","id": "1"}} }

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轉載于:https://www.cnblogs.com/davidwang456/p/10078301.html

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