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java.lang.NullPointerException: 	at org.elasticsearch.action.support.master.TransportMasterNodeAction$AsyncSingleAction.(TransportMasterNodeAction.java:129)	at org.elasticsearch.action.support.master.TransportMasterNodeAction.doExecute(TransportMasterNodeAction.java:107)	at org.elasticsearch.action.support.master.TransportMasterNodeAction.doExecute(TransportMasterNodeAction.java:51)	at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:137)	at org.elasticsearch.action.support.TransportAction.execute(TransportAction.java:85)	at org.elasticsearch.client.node.NodeClient.doExecute(NodeClient.java:58)