OpenSearch/docs/reference/query-dsl/parent-id-query.asciidoc

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[[query-dsl-parent-id-query]]
=== Parent Id Query
added[3.0.0]
The `parent_id` query can be used to find a child document pointing to a particular parent id.
The actual underlying Lucene field that is used to store to what parent id a child document is referring to
is determined by the child type's `_parent` field. This query helps by selecting the right field based
on the specified child type. Example:
[source,js]
--------------------------------------------------
{
"parent_id" : {
"type" : "blog_tag",
"id" : "1"
}
}
--------------------------------------------------
==== Parameters
This query has two required parameters:
[horizontal]
`type`::
The child type. This must be a type with `_parent` field.
`id`::
The required parent id select documents must referrer to.