Rename all databases when doing a mongorestore?
Should be this one:
mongorestore --nsInclude=&quot;PetHotel.*&quot; --nsFrom='PetHotel.*' --nsTo='PetHouse.*' dump/

mongorestore --nsInclude='*.*' --nsFrom='$database$.*' --nsTo='$database$2.*' dump/

First test it with option --dryRun
See Change Collections' Namespaces during Restore