Logstash "Successfully started Logstash API endpoin" Error

I am a beginner in logstash i am not sure how to fix this error.
"Successfully started Logstash API endpoint {:port=>9600}"

logstash.conf

    input {
    stdin{}
    }
    output {
    elasticsearch {
    hosts => ["localhost:9200"]
    }
    }

this is not an error, its showing the logstash started.

thanks for contributing!