Type-specific configuration for backward compatibility

def get_configuration_dict(self, secret_attrs=False):
        """Type-specific configuration for backward compatibility"""
        cd = {'repo_nexml2json': self.repo_nexml2json,
              'number_of_shards': len(self._shards),
              'initialization': self._filepath_args,
              'shards': [],
              }
        for i in self._shards:
            cd['shards'].append(i.get_configuration_dict(secret_attrs=secret_attrs))
        return cd