How does the search plugin work?

It says it integrates with Joomla's smart search. I tried reindexing, but that didn't seem to do it. Is there something else I have to do to get the DMS Documents indexed and available to the search module? My test site is testvvfh.vvfh.org/

I created a search page to use the DMS search. It works fine, but I'd like to make one change. The search results page doesn't have a link to return to the search. What page would I need to edit to add that feature? Or, can I make that a feature request?

This is the link to the search page that I created. testvvfh.vvfh.org/index.php/books/customer-orders

Once you have done a search, the results page doesn't offer a return to the search page so you can do a second search.,

It was my understanding, from the documentation, that the DMS search feature was fully integrated with the Joomla Smart Search.

dmsdoc.joomservices.com/plugins/search

"This plugin allows users to search for documents which you setup in Documents Seller via Joomla standard search.

To enable this feature, just go to Extensions -> Plugins, find and enable the plugin Search - Documents Seller"

I understood that to mean that once I had enabled the plugin, the Joomla Smart Search would index dms documents. Is that not the case?