Getting exception on elasticSearch client program

I am beginner to ELK technology stack and does not understand the error, your guideance will be extremely helpful.

I tried application to convert csv file to json file using ELK server.I have setup kibana-5.6.1-windows-x86 and elasticsearch-5.6.1 on my local machine.

I am getting below exception.
Please guide me here.

org.elasticsearch.action.ActionRequestValidationException: Validation Failed: 1: scrollId is missing;
at org.elasticsearch.action.ValidateActions.addValidationError(ValidateActions.java:29)
at org.elasticsearch.action.search.SearchScrollRequest.validate(SearchScrollRequest.java:55)
at org.elasticsearch.action.TransportActionNodeProxy.execute(TransportActionNodeProxy.java:46)
at org.elasticsearch.client.transport.TransportProxyClient.lambda$execute$0(TransportProxyClient.java:59)
at org.elasticsearch.client.transport.TransportClientNodesService.execute(TransportClientNodesService.java:231)
at org.elasticsearch.client.transport.TransportProxyClient.execute(TransportProxyClient.java:59)
at org.elasticsearch.client.transport.TransportClient.doExecute(TransportClient.java:345)
at org.elasticsearch.client.support.AbstractClient.execute(AbstractClient.java:403)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:80)
at org.elasticsearch.action.ActionRequestBuilder.execute(ActionRequestBuilder.java:54)
at com.ibm.etllogsgenerator.elasticsearch.ElasticSearchClient.prepareSearchScroll(ElasticSearchClient.java:141)
at com.ibm.etllogsgenerator.core.AAAAGenerator.run(AAAAGenerator.java:110)
at com.ibm.etllogsgenerator.core.AppInit.run(AppInit.java:43)
at com.ibm.etllogsgenerator.core.AppInit.main(AppInit.java:78)

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