Solr search - limit to documents that contain ONLY keyword

Hello, everyone.

Is there a way to either configure the Solr collection, or CF code to use, that will limit the search to return only documents that contain the keyword, and NOT documents that may be contextually related?

For example, if a user enters a keyword of "pets", return a list of documents (PDFs) that contain ONLY the word "pets" (not "pet", not "petroleum", not "petty", etc.)  The client wants only documents with specific keywords, only.

I've tried using type="explicit" in the CFSEARCH tag, but no matter what type I set it to CF Server 9.0.1 stops with the message "error executing query:unknown_handler_explicit".

I know that the contextual search is what makes Solr so robust.  Is there a way to override contextual searching?

Thanks,

^_^