Logstash log4j warning

I am using
java version "1.8.0_74"
logstash 5.4.2

In logstash-stderr.log , I see the following error.

log4j:WARN No appenders could be found for logger (org.apache.http.client.protocol.RequestAuthCache).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

FYI, logstash-stdout.log is showing correct output from running *.conf files.

Don't worry about that warning. I'm a bit surprised that it shows up but it won't prevent Logstash from working.

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