ES7.5.1日期报错，请大神指导，谢谢

ElasticsearchParseException[failed to parse date field [Sun Dec 31 16:00:00 UTC 2017] with format [yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis]]; nested: IllegalArgumentException[Parse failure at index [0] of [Sun Dec 31 16:00:00 UTC 2017]];