mutate 类型转换

[elk@Vsftp logstash]$ cat grok.conf 
input {stdin {}}
 filter {
  grok {
   match =>{
   "message" =>"s+(?<request_time>d+(?:.d+)?)s+"
      }
  }
}

output {
        stdout {
                        codec => rubydebug
                }
}

[elk@Vsftp logstash]$ logstash -f grok.conf 
Settings: Default pipeline workers: 4
Pipeline main started
BEGIN 123.321 END
{
         "message" => "BEGIN 123.321 END",
        "@version" => "1",
      "@timestamp" => "2017-02-08T07:08:17.638Z",
            "host" => "Vsftp",
    "request_time" => "123.321"
}


可以看到这里时间变成了字符串

[elk@Vsftp logstash]$ cat grok.conf 
input {stdin {}}
 filter {
  grok {
   match =>{
   "message" =>"s+(?<request_time>d+(?:.d+)?)s+"
      }
  }
  mutate {
    convert =>["request_time","float"]
}
}

output {
        stdout {
                        codec => rubydebug
                }
}
[elk@Vsftp logstash]$ logstash -f grok.conf 
Settings: Default pipeline workers: 4
Pipeline main started
BEGIN 123.321 END
{
         "message" => "BEGIN 123.321 END",
        "@version" => "1",
      "@timestamp" => "2017-02-08T07:11:06.794Z",
            "host" => "Vsftp",
    "request_time" => 123.321
}

把字符串转换我float