NoNodeAvailableException[None of the configured nodes are available

可能的原因：

1、项目引用的ES版本和ES服务的版本不一样；

2、端口不正确，tcp访问端口是9300；

3、cluster.name不正确，可以通过访问http://localhost:9200/查看ES服务下的cluster.name;

4、ES服务没启动；

简单demo：

import java.net.InetAddress;
import java.net.UnknownHostException;
import org.elasticsearch.action.search.SearchRequestBuilder;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.transport.client.PreBuiltTransportClient;
 
public class ElasticDemo {
 
	 //测试demo
		@SuppressWarnings({ "resource", "unchecked" })
		public static void main(String[] aa) throws UnknownHostException {
	    	TransportClient client = null;
	    	Settings esSettings = Settings.builder()
	                .put("cluster.name", "elasticsearch") //设置ES实例的名称
	                .build();
	        client = new PreBuiltTransportClient(esSettings)
	                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
	        System.out.println("ElasticsearchClient 连接成功");
	    	
//	    	BulkRequestBuilder bulkRequest = client.prepareBulk();
//	        try {
//				bulkRequest.add(client.prepareIndex("ko", "test", "14")
//				        .setSource(jsonBuilder()
//				                .startObject()
//				                .field("tableId", "14")
//				                .field("title", "tetstcccfffffccccccccccc")
//				                .field("content", "ttttttttfffffffttttttttttt")
//				                .endObject()
//				        )
//				);
//			} catch (IOException e) {
//				e.printStackTrace();
//			}
//	        BulkResponse bulkResponse = bulkRequest.get();
//	        if (bulkResponse.hasFailures()) {
//	            System.out.println("失败：" + bulkResponse.toString());
//	        }
//	        System.out.println("操作成功");
	    	
	        HighlightBuilder highlightBuilder = new HighlightBuilder().field("title").requireFieldMatch(true);
	        highlightBuilder.preTags("<span style=\"color:red\">");
	        highlightBuilder.postTags("</span>");
	        highlightBuilder.boundaryMaxScan(4);
	        
	        SearchRequestBuilder searchRequestBuilder = client.prepareSearch("ko");	//可以是多个index
	        //searchRequestBuilder.setQuery(QueryBuilders.termQuery("title", "ffff"));	//精确查询
	        searchRequestBuilder.setQuery(QueryBuilders.wildcardQuery("title", "*文 el*"));	//模糊查询
	        searchRequestBuilder.setFrom(0);
	        searchRequestBuilder.setSize(2);
	        searchRequestBuilder.highlighter(highlightBuilder);
	        SearchResponse response = searchRequestBuilder.get();
	        System.out.println(response);
	    }
		
}