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[[mapping-meta-field]]
=== `_meta` field
Each mapping type can have custom meta data associated with it. These are not
used at all by Elasticsearch, but can be used to store application-specific
metadata, such as the class that a document belongs to:
[source,js]
--------------------------------------------------
PUT my_index
{
"mappings": {
"user": {
"_meta": { <1>
"class": "MyApp::User",
"version": {
"min": "1.0",
"max": "1.3"
}
}
}
}
}
--------------------------------------------------
// CONSOLE
<1> This `_meta` info can be retrieved with the
<<indices-get-mapping,GET mapping>> API.
The `_meta` field can be updated on an existing type using the
<<indices-put-mapping,PUT mapping>> API.
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