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[[mapping-size-field]]
=== `_size`

The `_size` field allows to automatically index the size of the original
`_source` indexed. By default, it's disabled. In order to enable it, set
the mapping to:

[source,js]
--------------------------------------------------
{
    "tweet" : {
        "_size" : {"enabled" : true}
    }
}
--------------------------------------------------

In order to also store it, use:

[source,js]
--------------------------------------------------
{
    "tweet" : {
        "_size" : {"enabled" : true, "store" : true }
    }
}
--------------------------------------------------