DocFetcher has a misc/paths.txt file that allows customizing the location of the indexes. In DocFetcher Pro, the misc/paths.txt file is gone without replacement for technical reasons (namely known bugginess and program instability), so relocating the indexes that way is not possible with DocFetcher Pro. However, there is still another way: In the portable versions of DocFetcher Pro, the indexes are inside the program folder, and this folder can be moved around freely. As for DocFetcher Server, it is essentially a portable application on all platforms, so to relocate the indexes you can simply move the entire program folder.