generator-jhipster: LogstashTcpSocketAppender seems broken

Overview of the issue

LogstashTcpSocketAppender seems broken.

logs:

09:40:38,682 |-WARN in net.logstash.logback.appender.LogstashTcpSocketAppender[LOGSTASH] - Log destination localhost/127.0.0.1:5000: connection failed. java.net.ConnectException: Connection refused (Connection refused)
	at java.net.ConnectException: Connection refused (Connection refused)
	at 	at java.net.PlainSocketImpl.socketConnect(Native Method)
	at 	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at 	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at 	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at 	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at 	at java.net.Socket.connect(Socket.java:589)
	at 	at net.logstash.logback.appender.AbstractLogstashTcpSocketAppender$TcpSendingEventHandler.openSocket(AbstractLogstashTcpSocketAppender.java:586)
	at 	at net.logstash.logback.appender.AbstractLogstashTcpSocketAppender$TcpSendingEventHandler.onStart(AbstractLogstashTcpSocketAppender.java:508)
	at 	at net.logstash.logback.appender.AsyncDisruptorAppender$EventClearingEventHandler.onStart(AsyncDisruptorAppender.java:351)
	at 	at net.logstash.logback.encoder.com.lmax.disruptor.BatchEventProcessor.notifyStart(BatchEventProcessor.java:224)
	at 	at net.logstash.logback.encoder.com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:120)
	at 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at 	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at 	at java.lang.Thread.run(Thread.java:748)
09:40:38,696 |-WARN in net.logstash.logback.appender.LogstashTcpSocketAppender[LOGSTASH] - Log destination localhost/127.0.0.1:5000: Waiting 29983ms before attempting reconnection.
09:40:38,694 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - 'FileNamePattern' option has the same value "/tmp/spring.log.%d{yyyy-MM-dd}.%i.gz" as that given for appender [FILE] defined earlier.
09:40:38,697 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - Collisions detected with FileAppender/RollingAppender instances defined earlier. Aborting.
09:40:38,697 |-ERROR in ch.qos.logback.core.rolling.RollingFileAppender[FILE] - For more information, please visit http://logback.qos.ch/codes.html#earlier_fa_collision

JHipster Version(s)

See current master