You need to create a client entry in Networker - the client itself does not need to be there as you can do a directed recovery to another client but to create the client the IP needs to be resolvable so you may have to put a dummy entry in your hosts file.
If it is still not browsable try to recover the index using:

nsrck -L7 -t timeofrecoveryofindex client

timeofrecoveryofindex will be a time after the backup ideally when a full backup of the index was made.

After that it should work.