~/mongo $ ls dump/test
%CE%B7%CE%BC%CE%B5%CF%81%CE%BF%CE%BB%CF%8C%CE%B3%CE%B9%CE%BF.bson		caf%C3%A9s.bson
%CE%B7%CE%BC%CE%B5%CF%81%CE%BF%CE%BB%CF%8C%CE%B3%CE%B9%CE%BF.metadata.json	caf%C3%A9s.metadata.json

# First attempt using the unencoded names
~/mongo $ ./mongodb-4.2.0-rc2/bin/mongorestore -u kayadmin -p abc123 --authenticationDatabase=admin --nsInclude test.cafés dump/
2019-07-08T14:00:39.908-0400	preparing collections to restore from
2019-07-08T14:00:39.908-0400	0 document(s) restored successfully. 0 document(s) failed to restore.
# Second attempt using the encoded names -- which we probably don't want people to use, but just for illustrative purposes 
~/mongo $ ./mongodb-4.2.0-rc2/bin/mongorestore -u kayadmin -p abc123 --authenticationDatabase=admin --nsInclude test.caf%C3%A9s dump/
2019-07-08T14:03:06.831-0400	preparing collections to restore from
2019-07-08T14:03:06.831-0400	0 document(s) restored successfully. 0 document(s) failed to restore.

~/mongo $ ./mongodb-4.2.0-rc2/bin/mongorestore -u kayadmin -p abc123 --authenticationDatabase=admin dump/
2019-07-08T14:03:12.689-0400	preparing collections to restore from
2019-07-08T14:03:12.693-0400	reading metadata for test.cafés from dump/test/caf%C3%A9s.metadata.json
2019-07-08T14:03:12.693-0400	reading metadata for test.ημερολόγιο from dump/test/%CE%B7%CE%BC%CE%B5%CF%81%CE%BF%CE%BB%CF%8C%CE%B3%CE%B9%CE%BF.metadata.json
2019-07-08T14:03:12.727-0400	restoring test.ημερολόγιο from dump/test/%CE%B7%CE%BC%CE%B5%CF%81%CE%BF%CE%BB%CF%8C%CE%B3%CE%B9%CE%BF.bson
2019-07-08T14:03:12.741-0400	no indexes to restore
2019-07-08T14:03:12.741-0400	finished restoring test.ημερολόγιο (1 document, 0 failures)
2019-07-08T14:03:12.757-0400	restoring test.cafés from dump/test/caf%C3%A9s.bson
2019-07-08T14:03:12.766-0400	no indexes to restore
2019-07-08T14:03:12.766-0400	finished restoring test.cafés (1 document, 0 failures)
2019-07-08T14:03:12.766-0400	restoring users from dump/admin/system.users.bson
2019-07-08T14:03:12.806-0400	restoring roles from dump/admin/system.roles.bson
2019-07-08T14:03:12.890-0400	2 document(s) restored successfully. 0 document(s) failed to restore.