Yes, although it is optional. URL mapping allows portal administrators to create a different URL and map it to portal pages.
When the directory path is entered for a file system collection, URL mapping may be optionally set for each directory.
For example, C:\testfolder can be mapped to http://www.examplesite.com so that even though SearchBlox indexes the content from the file system, when a user clicks on the search result, the web document is served from the web server. The child path would be automatically mapped to the URL.