记录下，网络设备默认有些日志内容无用，用正则替换删除
input{
udp {host => "127.0.0.1" port => 515 type => "Hillstone"}
}
filter {
mutate {
gsub => [ "message", "\, vr trust-vr, user -@UNKNOWN, host -, rule [12456789]0\n\u0000", "" ]
remove_field => [ "@version" ]
}
}
message ：日志字段
, vr trust-vr, user -@UNKNOWN, host -, rule [12456789]0\n\u0000 ：日志内容
@version：默认字段
