Java MongoDB正在保存ID

import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

public class MongoDBExample {
    public static void main(String[] args) {
        // 连接到MongoDB数据库
        String connectionString = "mongodb://localhost:27017";
        try (var mongoClient = MongoClients.create(connectionString)) {
            // 选择数据库和集合
            MongoDatabase database = mongoClient.getDatabase("mydb");
            MongoCollection<Document> collection = database.getCollection("mycollection");

            // 创建文档并保存ID字段
            Document document = new Document();
            document.append("ID", "123456");
            document.append("name", "John Doe");
            document.append("age", 30);

            // 插入文档
            collection.insertOne(document);
        }
    }
}