java.net.UnknownHostException: LOGSTASH_HOST_IS_UNDEFINED: unknown error

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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.classic.util.ContextInitializer.configureByResource(ContextInitializer.java:75)
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.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)

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