kibana上传日志时间与日志里面的时间不同

中间加了一层转换，日志从filebeat采集进入logstash，然后将日志中的时间字段覆盖到es的@timestamp字段，kibana会将这个字段当做是日志的上传时间

input {
  beats {
    port => 10515
  }
}

filter{
  if "xxx" in [tags]{
    grok {
        match => ["message","%{TIMESTAMP_ISO8601:log.date}"]
    }
    date {
        match => ["log.date", "yyyy-MM-dd HH:mm:ss,SSS"]
        target => "@timestamp"
    }
  }
  if "xxx" in [tags]{
    grok {
        match => ["message","%{TIMESTAMP_ISO8601:timestamp8601}"]
    }
    date {
        match => ["timestamp8601", "yyyy-MM-dd HH:mm:ss.SSS"]
        target => "@timestamp"
    }
  }
  if "xxx" in [tags]{
    grok {
        match => ["message","%{TIMESTAMP_ISO8601:timestamp8601}"]
    }
    date {
        match => ["timestamp8601", "yyyy-MM-dd HH:mm:ss.SSS"]
        target => "@timestamp"
    }
  }

}

output {
  if "xxx" in [tags]{
     elasticsearch {
       hosts => ["http://xxx:9200"]
       #index => "%{[@metadata][beat]}-%{[@metadata][version]}-%{+YYYY.MM.dd}"
       index => "xxx-%{+YYYY.MM}"
       user => "xxx"
       password => "xxx"
     }
  }

  if "xxx" in [tags]{
     elasticsearch {
       hosts => ["http://xxx:9200"]
       #index => "%{[@metadata][beat]}-%{[@metadata][version]}-%{+YYYY.MM.dd}"
       index => "xxx-%{+YYYY.MM}"
       user => "xxx"
       password => "xxx"
     }
  }
  if "xxx" in [tags]{
     elasticsearch {
       hosts => ["http://xxx:9200"]
       #index => "%{[@metadata][beat]}-%{[@metadata][version]}-%{+YYYY.MM.dd}"
       index => "xxx-%{+YYYY.MM}"
       user => "xxx"
       password => "xxx"
     }
  }

}