If you want to change the location of the Lucene Search Indexes because they can sometimes take up a large amount of disk space, this can be done by edited the web.config file.
This will be located in the folder below:
C:\Program Files (x86)\Autodesk\ADMS Professional 2011\Server\Web\Services
First, make a Copy of the original web.config file, then edit the web.config file in Notepad (Do not edit in Word or any other application that adds formatting).
Change the Value in quote in the following line, to the desired location.