def health_check(self):
        """Uses head object to make sure the file exists in S3."""
        logger.debug('Health Check on S3 file for: {namespace}'.format(
            namespace=self.namespace
        ))

        try:
            self.client.head_object(Bucket=self.bucket_name, Key=self.data_file)
            return True
        except ClientError as e:
            logger.debug('Error encountered with S3.  Assume unhealthy')
Uses head object to make sure the file exists in S3.