如何将两个文档作为一个文档插入到solr中

import org.apache.solr.client.solrj.SolrClient;
import org.apache.solr.client.solrj.SolrInputDocument;
import org.apache.solr.client.solrj.impl.HttpSolrClient;

public class SolrDocumentInsertionExample {
    public static void main(String[] args) throws Exception {
        String solrUrl = "http://localhost:8983/solr/my_core";  // Solr服务器URL和核心名称
        SolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();  // 创建Solr客户端
        
        SolrInputDocument document1 = new SolrInputDocument();  // 创建文档1
        document1.addField("id", "1");
        document1.addField("title", "Document 1");
        document1.addField("content", "This is the content of document 1.");
        
        SolrInputDocument document2 = new SolrInputDocument();  // 创建文档2
        document2.addField("id", "2");
        document2.addField("title", "Document 2");
        document2.addField("content", "This is the content of document 2.");
        
        SolrInputDocument mergedDocument = new SolrInputDocument();  // 合并文档
        mergedDocument.addField("id", "3");
        mergedDocument.addField("title", "Merged Document");
        mergedDocument.addField("content", document1.getFieldValue("content") + " " + document2.getFieldValue("content"));
        
        solrClient.add(mergedDocument);  // 添加合并后的文档到Solr索引
        solrClient.commit();  // 提交更改
        
        solrClient.close();  // 关闭Solr客户端连接
    }
}