Java代码用于操作ElasticSearch的RestAPI

import org.apache.http.HttpHost;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;
 
public class ElasticSearchClient {
    private static final int ELASTIC_SEARCH_PORT = 9200;
    private static final String ELASTIC_SEARCH_SCHEME = "http";
    private static final String ELASTIC_SEARCH_HOST = "localhost";
 
    public static RestHighLevelClient createClient() {
        final RestClientBuilder builder = RestClient.builder(new HttpHost(ELASTIC_SEARCH_HOST, ELASTIC_SEARCH_PORT, ELASTIC_SEARCH_SCHEME));
        return new RestHighLevelClient(builder);
    }
 
    public static void closeClient(RestHighLevelClient client) {
        if (client != null) {
            try {
                client.close();
            } catch (final Exception e) {
                e.printStackTrace();
            }
        }
    }
 
    public static void main(String[] args) throws IOException {
        // 创建Elasticsearch客户端
        RestHighLevelClient client = createClient();
 
        // 执行操作，例如索引创建、搜索、更新等
        // ...
 
        // 关闭客户端
        closeClient(client);
    }
}

这段代码展示了如何在Java中创建和关闭一个Elasticsearch的RestHighLevelClient实例，用于与Elasticsearch集群进行交互。在main方法中，可以添加具体的Elasticsearch操作逻辑。