Custom Log Level Log4J

input {
log4j {
type => "log4j"
port => 5000
mode => "server"
}
}
here is the input of my logstash.config file.

log4j.rootLogger=INFO, server, stdout
log4j.appender.server=org.apache.log4j.net.SocketAppender
log4j.appender.server.Port=5000
log4j.appender.server.RemoteHost=10.97.162.58
log4j.appender.server.ReconnectionDelay=10000

and my properties file.