Creates multiple statement entries.

def create_many(self, statements):
        """
        Creates multiple statement entries.
        """
        create_statements = []

        for statement in statements:
            statement_data = statement.serialize()
            tag_data = list(set(statement_data.pop('tags', [])))
            statement_data['tags'] = tag_data

            if not statement.search_text:
                statement_data['search_text'] = self.tagger.get_bigram_pair_string(statement.text)

            if not statement.search_in_response_to and statement.in_response_to:
                statement_data['search_in_response_to'] = self.tagger.get_bigram_pair_string(statement.in_response_to)

            create_statements.append(statement_data)

        self.statements.insert_many(create_statements)