after disable the file content index there are a lot of files in
/vashare/cachefilestore/. I assume that this are index files. How to
remove these files to get my storage back?

Will they be automaticly remove after some time or do I have delete them
by hand or is there a point in the admin section which I have not found yet?

Even a hint to the correct page in the documentation where this is
described will be helpful.