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java.net.UnknownHostException: LOGSTASH_HOST_IS_UNDEFINED: unknown error	at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)	at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)	at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)	at java.net.InetAddress.getAllByName0(InetAddress.java:1276)	at java.net.InetAddress.getAllByName(InetAddress.java:1192)	at java.net.InetAddress.getAllByName(InetAddress.java:1126)	at java.net.InetAddress.getByName(InetAddress.java:1076)	at ch.qos.logback.core.net.SyslogOutputStream.(SyslogOutputStream.java:43)	at net.logstash.logback.appender.LogstashSocketAppender.createOutputStream(LogstashSocketAppender.java:215)	at ch.qos.logback.core.net.SyslogAppenderBase.start(SyslogAppenderBase.java:61)	at net.logstash.logback.appender.LogstashSocketAppender.start(LogstashSocketAppender.java:43)	at ch.qos.logback.core.joran.action.AppenderAction.end(AppenderAction.java:90)	at ch.qos.logback.core.joran.spi.Interpreter.callEndAction(Interpreter.java:309)	at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:193)	at ch.qos.logback.core.joran.spi.Interpreter.endElement(Interpreter.java:179)	at ch.qos.logback.core.joran.spi.EventPlayer.play(EventPlayer.java:62)	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:155)	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:142)	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:103)	at ch.qos.logback.core.joran.GenericConfigurator.doConfigure(GenericConfigurator.java:53)	at ch.qos.logback.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75)	at ch.qos.logback.classic.util.ContextInitializer.autoConfig(ContextInitializer.java:150)	at org.slf4j.impl.StaticLoggerBinder.init(StaticLoggerBinder.java:84)	at org.slf4j.impl.StaticLoggerBinder.(StaticLoggerBinder.java:55)	at org.slf4j.LoggerFactory.bind(LoggerFactory.java:150)	at org.slf4j.LoggerFactory.performInitialization(LoggerFactory.java:124)	at org.slf4j.LoggerFactory.getILoggerFactory(LoggerFactory.java:412)	at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:357)	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)	at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)	at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:273)	at org.springframework.boot.SpringApplication.(SpringApplication.java:189)	at com.company.app.Application.main(DigitalMeetingApplication.java:12)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)