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java.util.ConcurrentModificationException at java.util.Hashtable$Enumerator.next(Hashtable.java:1367)[?:1.8.0_40] at org.elasticsearch.common.settings.Settings$Builder.putProperties(Settings.java:1096) at org.elasticsearch.node.internal.InternalSettingsPreparer.initializeSettings(InternalSettingsPreparer.java:124) at org.elasticsearch.node.internal.InternalSettingsPreparer.prepareSettings(InternalSettingsPreparer.java:63) at org.elasticsearch.client.transport.TransportClient$Builder.build(TransportClient.java:117)