Label individual instances of logstash through cmdline params

Is there a way to label individual instances of logstash ? I run multiple logstash instances on a host and it works fine. But when I run topbeat on the host, it identifies that same proc.name for all the instances

if there was a way to label individual instances by passing in identifiers in command line params, I can atleast grok the instance name and aggregate metrics per each individual logstash instance