elasticsearch-jdbc导入数据时下面这个错误，请问是什么原因呢？

[17:52:26,744][ERROR][org.xbib.elasticsearch.helper.client.BulkTransportClient][elasticsearch[importer][listener][T#5]] bulk [6343] error

org.elasticsearch.client.transport.NoNodeAvailableException: none of the configured nodes were available: [{Marvel Man}{C_Xu7HhtQcytkKSrKpENMg}{127.0.0.1}{localhost/127.0.0.1:9300}]

	at org.xbib.elasticsearch.helper.client.TransportClient$RetryListener.onFailure(TransportClient.java:465) ~[elasticsearch-helper-2.3.3.0.jar:?]

	at org.elasticsearch.action.ActionListenerResponseHandler.handleException(ActionListenerResponseHandler.java:46) ~[elasticsearch-2.3.3.jar:2.3.3]

	at org.elasticsearch.transport.TransportService$Adapter$3.run(TransportService.java:622) ~[elasticsearch-2.3.3.jar:2.3.3]

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_101]

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_101]

	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]

Caused by: org.elasticsearch.transport.NodeDisconnectedException: [Marvel Man][localhost/127.0.0.1:9300][indices:data/write/bulk] disconnected

[17:52:26,795][ERROR][org.xbib.elasticsearch.helper.client.BulkTransportClient][elasticsearch[importer][listener][T#8]] bulk [6301] error

org.elasticsearch.client.transport.NoNodeAvailableException: none of the configured nodes were available: [{Marvel Man}{C_Xu7HhtQcytkKSrKpENMg}{127.0.0.1}{localhost/127.0.0.1:9300}]

	at org.xbib.elasticsearch.helper.client.TransportClient$RetryListener.onFailure(TransportClient.java:465) ~[elasticsearch-helper-2.3.3.0.jar:?]

	at org.elasticsearch.action.ActionListenerResponseHandler.handleException(ActionListenerResponseHandler.java:46) ~[elasticsearch-2.3.3.jar:2.3.3]

	at org.elasticsearch.transport.TransportService$Adapter$3.run(TransportService.java:622) ~[elasticsearch-2.3.3.jar:2.3.3]

	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_101]

	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_101]

	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_101]

Caused by: org.elasticsearch.transport.NodeDisconnectedException: [Marvel Man][localhost/127.0.0.1:9300][indices:data/write/bulk] disconnected