code: def list_remove(self, key, index, **kwargs):
          
          return self.map_remove(key, '[{0}]'.format(index), **kwargs)
docs: Remove the element at a specific index from a list.
  
          :param key: The document ID of the list
          :param index: The index to remove
          :param kwargs: Arguments to :meth:`mutate_in`
          :return: :class:`OperationResult`
          :raise: :exc:`IndexError` if the index does not exist
          :raise: :cb_exc:`NotFoundError` if the list does not exist