Aggregate a count of matched words among documents

Hi everyone. I have a set of documents that represent web site pages, and
I'd like to query the total word matches for a term within a specific
site. For example, find all documents from the site "www.example.com" and
count the total number of occurrences of words matching "example" among the
documents.

I don't want the number of document hits - I want to know how many times a
word is mentioned within the site's content.

Is this possible? Can someone give me a rough idea of where to start?

Thanks,
Travis

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