code: def match_not_exists(self, field, new_group=False):
          
          return self.exclude_field(field, "*", new_group=new_group)
docs: Require a field to not exist in the results.
          Matches will not have ``field`` present.
  
          Arguments:
              field (str): The field to check.
                      The field must be namespaced according to Elasticsearch rules
                      using the dot syntax.
                      For example, ``"mdf.source_name"`` is the ``source_name`` field
                      of the ``mdf`` dictionary.
              new_group (bool): If ``True``, will separate the term into a new parenthetical group.
                      If ``False``, will not.
                      **Default:** ``False``.
  
          Returns:
              SearchHelper: Self