code: def get_filtered_keys(self, suffix, *args, **kwargs):
          
  
          args = self.prepare_args(args, transform=False)
  
          for index in self._indexes:
              if index.can_handle_suffix(suffix):
                  return index.get_filtered_keys(suffix, *args, **kwargs)
docs: Returns the index keys to be used by the collection for the given args
  
          For the parameters, see BaseIndex.get_filtered_keys