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Original file line number Diff line number Diff line change
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---
applies_to:
serverless: unavailable
navigation_title: "Join"
mapped_pages:
- https://www.elastic.co/guide/en/elasticsearch/reference/current/parent-join.html
---

# Join field type [parent-join]


The `join` data type is a special field that creates parent/child relation within documents of the same index. The `relations` section defines a set of possible relations within the documents, each relation being a parent name and a child name.

::::{warning}
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