java es 删除数据

Java程序中可以使用Elasticsearch的Java API来删除数据。具体步骤如下：

1. 创建Elasticsearch客户端对象

TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
        .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300));

2. 构建DeleteRequest对象

DeleteRequest request = new DeleteRequest("index_name", "type_name", "document_id");

其中，"index_name"是要删除的索引名称，"type_name"是要删除的文档类型名称，"document_id"是要删除的文档ID。

3. 执行删除操作

DeleteResponse response = client.delete(request).get();

4. 关闭Elasticsearch客户端对象

client.close();

完整代码示例：

import org.elasticsearch.action.delete.DeleteRequest;
import org.elasticsearch.action.delete.DeleteResponse;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.transport.TransportAddress;
import org.elasticsearch.transport.client.PreBuiltTransportClient;

import java.net.InetAddress;

public class ElasticsearchDeleteDemo {
    public static void main(String[] args) throws Exception {
        // 创建Elasticsearch客户端对象
        TransportClient client = new PreBuiltTransportClient(Settings.EMPTY)
                .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300));

        // 构建DeleteRequest对象
        DeleteRequest request = new DeleteRequest("index_name", "type_name", "document_id");

        // 执行删除操作
        DeleteResponse response = client.delete(request).get();

        // 输出删除结果
        System.out.println("Deleted: " + response);

        // 关闭Elasticsearch客户端对象
        client.close();
    }
}