opensearch-docs-cn/_field-types/object-fields.md

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default	Object field types	40	true	false	Supported field types

Object field types

The following table lists all object field types that OpenSearch supports.

Field data type	Description
object	A JSON object.
nested	Used when objects in an array need to be indexed independently as separate documents.
flat_object	A JSON object treated as a string.
join	Establishes a parent-child relationship between documents in the same index.