如何在spring或Spring boot中以编程方式在spring Mongo数据中创建综合指数？

// 配置MongoDB连接
@Configuration
public class MongoConfig {

    @Value("${spring.data.mongodb.host}")
    private String host;

    @Value("${spring.data.mongodb.port}")
    private int port;

    @Value("${spring.data.mongodb.database}")
    private String database;

    @Value("${spring.data.mongodb.username}")
    private String username;

    @Value("${spring.data.mongodb.password}")
    private String password;

    @Bean
    public MongoClient mongoClient() {
        MongoCredential credential = MongoCredential.createCredential(username, database, password.toCharArray());
        ServerAddress serverAddress = new ServerAddress(host, port);
        MongoClientSettings settings = MongoClientSettings.builder()
                .credential(credential)
                .applyToClusterSettings(builder -> builder.hosts(Collections.singletonList(serverAddress)))
                .build();
        return MongoClients.create(settings);
    }

    @Bean
    public MongoTemplate mongoTemplate(MongoClient mongoClient) {
        return new MongoTemplate(mongoClient, database);
    }
}

// 创建MongoDB实体类
@Document(collection = "index")
public class Index {

    @Id
    private String id;

    private String name;

    private double value;

    // 省略getter和setter方法
}

// 创建MongoDB Repository接口
@Repository
public interface IndexRepository extends MongoRepository<Index, String> {

    // 省略其他查询方法和数据操作方法
}

// 创建综合指数计算方法
@Service
public class IndexService {

    @Autowired
    private IndexRepository indexRepository;

    public void calculateCompositeIndex() {
        // 从MongoDB中读取数据并进行计算
        List<Index> indexes = indexRepository.findAll();
        double compositeIndex = 0.0;
        for (Index index : indexes) {
            compositeIndex += index.getValue();
        }

        // 将计算结果存储回MongoDB
        Index compositeIndexObj = new Index();
        compositeIndexObj.setName("Composite Index");
        compositeIndexObj.setValue(compositeIndex);
        indexRepository.save(compositeIndexObj);
    }
}

// 调用综合指数计算方法
@RestController
public class IndexController {

    @Autowired
    private IndexService indexService;

    @GetMapping("/calculate")
    public void calculateCompositeIndex() {
        indexService.calculateCompositeIndex();
    }
}