title: logfile endpoint does not find log path
body: <p>We have a Log4j2.xml which configures a RollingFileAppender. Now I want to expose these logs with the <code>logfile</code> actuator endpoint.</p>
  
  <p>If I specify logging.file in the application.yml like this</p>
  
  <pre><code>logging:
     file: target/logs/mylog.log
  </code></pre>
  
  <p>everything is fine.
  However, this does not work (invoking the logfile-endpoint results in a 404):</p>
  
  <pre><code>logging:
     path: /target/logs
  </code></pre>
  
  <p>How can I get the logfile endpoint to show the mylog-1.log, mylog-2.log,... files?</p>