code: def exclude_field(self, field, value, new_group=False):
          
          # No-op on missing arguments
          if not field and not value:
              return self
          # If not the start of the query string, add an AND
          # OR would not make much sense for excluding
          if self.initialized:
              self._and_join(new_group)
          self._negate()._field(str(field), str(value))
          return self
docs: Exclude a ``field:value`` term from the query.
          Matches will NOT have the ``value`` in the ``field``.
  
          Arguments:
              field (str): The field to check for the value.
                      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.
              value (str): The value to exclude.
              new_group (bool): If ``True``, will separate term the into a new parenthetical group.
                      If ``False``, will not.
                      **Default:** ``False``.
  
          Returns:
              SearchHelper: Self