java接入es的完整代码

这是一个简单的Java代码示例，用于连接Elasticsearch并索引一些数据：

import java.io.IOException;
import org.apache.http.HttpHost;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.rest.RestStatus;

public class ElasticsearchExample {
    public static void main(String[] args) throws IOException {
        RestHighLevelClient client = new RestHighLevelClient(
                RestClient.builder(new HttpHost("localhost", 9200, "http")));

        try {
            // 构建要索引的文档内容
            XContentBuilder builder = XContentFactory.jsonBuilder();
            builder.startObject();
            {
                builder.field("title", "Java编程入门");
                builder.field("author", "张三");
                builder.field("price", 29.99);
                builder.field("description", "一本入门级Java编程教程");
            }
            builder.endObject();

            // 创建索引请求
            IndexRequest request = new IndexRequest("books");
            request.source(builder);

            // 发送索引请求
            RestStatus status = client.index(request, RequestOptions.DEFAULT).status();
            if (status == RestStatus.CREATED) {
                System.out.println("文档已成功索引！");
            } else {
                System.out.println("文档索引失败！");
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭客户端连接
            client.close();
        }
    }
}

这个示例连接到本地运行的Elasticsearch实例，索引一本书的信息。注意：在运行此代码之前，请确保你已经安装并启动了Elasticsearch，并且已经在Elasticsearch中创建了名为“books”的索引。