Node.name not reflected in "host"

[Makra (Makara)]

About host field value

Hi. I am using udp input plugin to listen to syslog messages. The documentation says that the host field is the "The address which logstash will listen on". This is exacly what I need, but instead, host value is the IP address of the machine that sends the syslog message. Is that how it should be? Any way I can get the name of the LogStash machine no matter which plugin I am using? Thx in advance for your help.