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java.lang.IllegalStateException: 	at org.graylog2.UI.exitHardWithWall(UI.java:40)	at org.graylog2.indexer.Indexer.start(Indexer.java:205)	at org.graylog2.initializers.IndexerSetupService.startUp(IndexerSetupService.java:66)	at com.google.common.util.concurrent.AbstractIdleService$2$1.run(AbstractIdleService.java:54)	at com.google.common.util.concurrent.Callables$3.run(Callables.java:95)	at java.lang.Thread.run(Thread.java:745)