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[[mapping-parent-field]]
=== `_parent`
The parent field mapping is defined on a child mapping, and points to
the parent type this child relates to. For example, in case of a `blog`
type and a `blog_tag` type child document, the mapping for `blog_tag`
should be:
[source,js]
--------------------------------------------------
{
"blog_tag" : {
"_parent" : {
"type" : "blog"
}
}
}
--------------------------------------------------
The mapping is automatically stored and indexed (meaning it can be
searched on using the `_parent` field notation).
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