"_index": "meipianapp-2016.10.18",
  "_type": "log4j",
  "_id": "AVfXDMl1egLz1PD_qnMm",
  "_score": null,
  "_source": {
    "message": "用户查询时光祭异常:MjController.userMjActivityPast: aMapCityCode:010",
    "@version": "1",
    "@timestamp": "2016-10-18T09:08:41.324Z",
    "timestamp": 1476781719183,
    "path": "com.meipian.core.api.controller.MjActivityController",
    "priority": "ERROR",
    "logger_name": "com.meipian.core.api.controller.MjActivityController",
    "thread": "http-bio-8080-exec-6",
    "class": "?",
    "file": "?:?",
    "method": "?",
请问为什么 class 和 file 和 method 是问号呢?
我的logstash配置如下:
nput {
  log4j {
    mode => "server"
    host => "0.0.0.0"
    port => 4567
    type => "log4j"
  }
}
    filter {
                date {
      match => [ "timestamp" , "dd/MMM/yyyy:HH:mm:ss +0800" ]
      timezone => "UTC"
           }
        }
output {
  elasticsearch {
     hosts=> ["10.105.103.125:9200"]
     index => "meipianapp-%{+YYYY.MM.dd}"
  }
}