@timestamp problem

[ghost]

Source:

<source>
 @type tail
 path /var/log/audit/audit.log
 read_from_head true
 pos_file /var/log/os/auditTest.log.pos
 tag syslog.audit
 <parse>
    @type none
  </parse>
</source>

Match:

<match syslog.audit.**>
  @type opensearch
  scheme https
  ssl_verify false
  hosts http://xxxxxxxxxx,  
  user admin
  password admin
  index_name oslog-audit-%Y%m%d
  include_timestamp true
  utc_index false
      <buffer tag,time>
       timekey 60
       timekey_wait 0
       timekey_use_utc false   
       timekey_zone +0800
      </buffer>
</match>

problem: