[[query-dsl-parent-id-query]] === Parent Id Query The `parent_id` query can be used to find child documents which belong to a particular parent. Given the following mapping definition: [source,js] -------------------------------------------- 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" } } -------------------------------------------- // CONSOLE // TESTSETUP [source,js] -------------------------------------------------- GET /my_index/_search { "query": { "parent_id": { "type": "my_child", "id": "1" } } } -------------------------------------------------- // CONSOLE ==== Parameters This query has two required parameters: [horizontal] `type`:: The **child** type name, as specified in the <<parent-join,`join` field>>. `id`:: The ID of the parent document. `ignore_unmapped`:: When set to `true` this will ignore an unmapped `type` and will not match any documents for this query. This can be useful when querying multiple indexes which might have different mappings. When set to `false` (the default value) the query will throw an exception if the `type` is not mapped.