OpenSearch/docs/reference/mapping/dynamic/default-mapping.asciidoc

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[[default-mapping]]
=== `_default_` mapping
deprecated[6.0.0,See <<removal-of-types>>]
The default mapping, which will be used as the base mapping for a new
mapping type, can be customised by adding a mapping type with the name
`_default_` to an index, either when
<<indices-create-index,creating the index>> or later on with the
<<indices-put-mapping,PUT mapping>> API.
The documentation for this feature has been removed as it no longer makes
sense in 6.x where there can be only a single type per index.