Yeah , I have changed the port number and the error mesg changed to this:
logstash.pipeline ] Error registering plugin {:pipeline_id=>"main", :plugin=>"#<LogStash::FilterDelegator:0xf9b1246 @metric_events_out=org.jruby.proxy.org.logstash.instrument.metrics.counter.LongCounter$Proxy2 - name: out value:0, @metric_events_in=org.jruby.proxy.org.logstash.instrument.metrics.counter.LongCounter$Proxy2 - name: in value:0, @metric_events_time=org.jruby.proxy.org.logstash.instrument.metrics.counter.LongCounter$Proxy2 - name: duration_in_millis value:0, @id="42eb6a52cafe982c94f38926283166ed9cf0a6e3bc3729f313754a8b32718206", @klass=LogStash::Filters::Mutate, @metric_events=#LogStash::Instrument::NamespacedMetric:0x275a5554, @filter=<LogStash::Filters::Mutate convert=>{"userId"=>"Integer"}, id=>"42eb6a52cafe982c94f38926283166ed9cf0a6e3bc3729f313754a8b32718206", enable_metric=>true, periodic_flush=>false>>", :error=>"translation missing: en.logstash.agent.configuration.invalid_plugin_register", :thread=>"#<Thread:0x3778a666 run>"}
Your help is highly appreciated, I am very new to this.