Endpoint names for Direct2Experts should be named to indicate that the endpoints are for the use of Direct2Experts.
FS.xml provides parameters for use by Direct2Experts. It should be renamed d2e-parameters.xml
ctsasearch provides a callable API for Direct2Experts. It should be renamed d2e-search (BTW, Direct2experts has nothing to do with ctsasearch – that's a different initiative, a different approach (centralized, not federated) and different people).
Endpoint names are reported to Direct2Experts and are used by Direct2Experts by sites signing up. Changes to the names of the endpoints would need to be reported to Direct2Experts by each site upgrading to a new version with new endpoint names.