Obviously you did not move but copied the index to a new location. But this is only step - do not forget to open the client properties and in the "Globals (2 of 2)" tab to define the 'Index path' pointing to the new location. Then use nsrls client_name to verify the summary. Now you are ready to rename the default index directory. Run the nsrls command again. If the result is the same you are safe to delete the old files.  
Hello! I moved index to a new location for multiple clients using uasm -s -i "client_index_directory_name" | (cd target_directory; uasm -r). Then checked nsrck -L6. Everything works. But I noticed that there were still indexes in the old /nsr/index directory. Do they need to be removed by hand?
Move a Client File Index to a New Location