Filebeat在配置文件中配置了自身的日志输出，怎样修改日志输出的格式

filebeat.prospectors:
- input_type: log
  paths:
    - /var/log/dblog/*/*.log
    - /var/log/dblog/*/*.out
    - /var/log/dblog/*/*/*.log
    - /var/log/dblog/*/*/*.out
    - /bigdata/salut/components/logstash/logs/*.log
    - /var/log/messages
  tail_files: true
output.logstash:
  hosts: ['localhost:5044']
logging.level: info
logging.to_files: true
logging.to_syslog: false
logging.files:
  path: /var/log/filebeat
  name: mybeat.log
  keepfiles: 2
这是我filebeat.yml的配置信息
 
 
2018-08-13T16:10:58+08:00 INFO Non-zero metrics in the last 30s: filebeat.harvester.closed=1 filebeat.harvester.open_files=-1 filebeat.harvester.running=-1 libbeat.logstash.call_count.PublishEvents=6 libbeat.logstash.publish.read_bytes=36 libbeat.logstash.publish.write_bytes=7603 libbeat.logstash.published_and_acked_events=96
这是filebeat的日志输出
 
不知道filebeat再那里能修改日志的输出格式 
我想变成以下的格式
[2018-08-13T16:10:58+08:00] [INFO] Non-zero metrics in the last 30s: filebeat.harvester.closed=1 filebeat.harvester.open_files=-1 filebeat.harvester.running=-1 libbeat.logstash.call_count.PublishEvents=6 libbeat.logstash.publish.read_bytes=36 libbeat.logstash.publish.write_bytes=7603 libbeat.logstash.published_and_acked_events=96