Add a term to the query.

        Arguments:
            term (str): The term to add.

        Returns:
            SearchHelper: Self

def _term(self, term):
        """Add a term to the query.

        Arguments:
            term (str): The term to add.

        Returns:
            SearchHelper: Self
        """
        # All terms must be strings for Elasticsearch
        term = str(term)
        if term:
            self.__query["q"] += term
        return self