code: def get_configuration_dict(self, secret_attrs=False):
          
          cd = super(TreeCollectionsShard, self).get_configuration_dict(secret_attrs=secret_attrs)
          # "rename" some keys in the dict provided
          cd['number of collections'] = cd.pop('number of documents')
          cd['collections'] = cd.pop('documents')
          return cd
docs: Overrides superclass method and renames some properties