ElasticSearch学习笔记文档操作、RestHighLevelClient的使用

import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.index.IndexResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.xcontent.XContentType;
 
public class ElasticSearchDocumentExample {
    public static void main(String[] args) throws IOException {
        // 初始化RestHighLevelClient
        try (RestHighLevelClient client = new RestHighLevelClient(...)) {
            // 创建索引请求
            IndexRequest request = new IndexRequest("posts");
            
            // 设置索引文档的ID
            String jsonString = "{" +
                    "\"user\":\"kimchy\"," +
                    "\"postDate\":\"2023-04-07\"," +
                    "\"message\":\"trying out Elasticsearch\"" +
                    "}";
            request.source(jsonString, XContentType.JSON);
            
            // 执行请求，并获取响应
            IndexResponse indexResponse = client.index(request, RequestOptions.DEFAULT);
            
            // 打印索引操作的结果
            System.out.println("索引文档成功: " + indexResponse.getResult());
        }
    }
}

这段代码演示了如何使用RestHighLevelClient在Elasticsearch中创建和索引一个JSON文档。首先，创建了一个IndexRequest对象，并指定了要索引的文档和索引名称。然后，设置了文档的ID和要索引的JSON字符串内容。最后，使用RestHighLevelClient的index方法执行索引操作，并打印出操作结果。