最近公司在使用elasticsearch，使用的是6.5版本的。其中有一个需求就是需要把数据库已有的数据同步到elasticsearch中来，调研了几种方案。
logstash，elasticsearch-jdbc，自己实现。
暂时采用的是elasticsearch-jdbc，但是，同步的过程中，出现错误。错误在最下面
我想请问哪种方案合适？如果是elasticsearch-jdbc合适，那么，下面问题如何解决？
[importer.jdbc ][pool-2-thread-1] error while processing request: no cluster nodes available, check settings {autodiscover=false, client.transport.ignore_cluster_name=false, client.transport.nodes_sampler_interval=5s, client.transport.ping_timeout=5s, cluster.name=my-application, flush_interval=5s, host.0=127.0.0.1, max_actions_per_request=10000, max_concurrent_requests=4, max_volume_per_request=10mb, name=importer, port=9300, sniff=false}
org.elasticsearch.client.transport.NoNodeAvailableException: no cluster nodes available, check settings {autodiscover=false, client.transport.ignore_cluster_name=false, client.transport.nodes_sampler_interval=5s, client.transport.ping_timeout=5s, cluster.name=my-application, flush_interval=5s, host.0=127.0.0.1, max_actions_per_request=10000, max_concurrent_requests=4, max_volume_per_request=10mb, name=importer, port=9300, sniff=false}
at org.xbib.elasticsearch.helper.client.BulkTransportClient.init(BulkTransportClient.java:164) ~[elasticsearch-helper-2.3.4.0.jar:?]
at org.xbib.elasticsearch.helper.client.ClientBuilder.toBulkTransportClient(ClientBuilder.java:113) ~[elasticsearch-helper-2.3.4.0.jar:?]
at org.xbib.elasticsearch.jdbc.strategy.standard.StandardSink.createClient(StandardSink.java:348) ~[elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.elasticsearch.jdbc.strategy.standard.StandardSink.beforeFetch(StandardSink.java:100) ~[elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.elasticsearch.jdbc.strategy.standard.StandardContext.beforeFetch(StandardContext.java:183) ~[elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.elasticsearch.jdbc.strategy.standard.StandardContext.execute(StandardContext.java:164) ~[elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.tools.JDBCImporter.process(JDBCImporter.java:203) ~[elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.tools.JDBCImporter.newRequest(JDBCImporter.java:189) [elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.tools.JDBCImporter.newRequest(JDBCImporter.java:53) [elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.pipeline.AbstractPipeline.call(AbstractPipeline.java:50) [elasticsearch-jdbc-2.3.4.1.jar:?]
at org.xbib.pipeline.AbstractPipeline.call(AbstractPipeline.java:16) [elasticsearch-jdbc-2.3.4.1.jar:?]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_201]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_201]