Item search doesn't include file metadata

How do I make it so items can also search the metadata associated with its files?

Our website uses pdfText to extract the metadata from concert programs. Currently the search returns a page containing the file and its metadata. I'd like to be able disable file searching and have the associated item be returned instead.

What's the best solution? I've considered either changing the pdfText plugin to write to an item type metadata field, or changing how search/index.php outputs it's results.