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java.lang.NullPointerException: 	at java.util.TreeMap.getEntry(	at java.util.TreeMap.containsKey(	at java.util.TreeSet.contains(	at java.util.Collections$UnmodifiableCollection.contains(	at	at org.elasticsearch.plugins.InstallPluginCommand.execute(	at org.elasticsearch.plugins.InstallPluginCommand.execute(	at org.elasticsearch.cli.SettingCommand.execute(	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(	at org.elasticsearch.cli.MultiCommand.execute(	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(	at org.elasticsearch.cli.Command.main(	at org.elasticsearch.plugins.PluginCli.main(