java.lang.IllegalStateException: No match found at java.util.regex.Matcher.group(Matcher.java:536) ~[?:1.8.0_141] at org.elasticsearch.monitor.os.OsProbe.getControlGroups(OsProbe.java:213) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.monitor.os.OsProbe.getCgroup(OsProbe.java:402) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.monitor.os.OsProbe.osStats(OsProbe.java:454) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.monitor.os.OsService.<init>(OsService.java:45) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.monitor.MonitorService.<init>(MonitorService.java:45) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.node.Node.<init>(Node.java:345) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.node.Node.<init>(Node.java:229) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.bootstrap.Bootstrap$6.<init>(Bootstrap.java:214) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:214) ~[elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:306) [elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) [elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) [elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.cli.SettingCommand.execute(SettingCommand.java:54) [elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:96) [elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.cli.Command.main(Command.java:62) [elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:89) [elasticsearch-5.1.1.jar:5.1.1] at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:82) [elasticsearch-5.1.1.jar:5.1.1] [2018-08-16T09:08:07,332][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main] org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: No match found