Can _search_with_cluster also cluster the result if content is of type "attachment"?

When trying to use Carrot2 with elasticsearch, I need to map the field
which is of type attachment for creating the logical cluster. Will it be
able to cluster the result if the content is in base64 encoded format? (as
that field is of type attachment) and at the moment, it does not seem to be
doing so. Please suggest.

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