Getting a warning while using the latest version of logstash 1.5.3

Command executed : /opt/app/logstash/bin/logstash --configtest --config /home/logstash/apache.config

Warning received : '[DEPRECATED] use require 'concurrent' instead of require 'concurrent_ruby'
Configuration OK

Providing your config would probably help us help you.

This is benign, you can ignore it. We'll fix it

Tracking here concurrent ruby warning received when starting LS 1.5.3 · Issue #3662 · elastic/logstash · GitHub