def file_client(self):
        if not self._file_client:
            self._file_client = salt.fileclient.get_file_client(
                self.opts, self.pillar_rend)
        return self._file_client
Init log handler and store the collection handle
dataset/ETHPy150Open saltstack/salt/salt/utils/mako.py/SaltMakoTemplateLookup.file_client--crossover with--dataset/ETHPy150Open andreisavu/mongodb-log/mongolog/handlers.py/MongoHandler.__init__