Hello,
I was aware of this search integration capability for a long time, and have been meaning to set this up on a client's portal, which I just did and tested. Works great. However, I also found this inadvertently exposed content to unauthenticated users. I'm not suggesting this is a DMX issue, but a scenario easily overlooked.
My client has DMX module on a hidden page which is used to make files available for download to unauthenticated users by sending them a link to the page.
What I discovered when I did a portal search as an unauthenticated user (after setting up the integration) is that these files (predictably) were returned during a portal search, which is clearly not desireable. I have removed the search integration until I implement an alternative mechanism for the hidden page/module.
Hope this helps someone.
Rob Ralston