如何用父文档- Spring data Mongo DB扁平化动态字段

@Document(collection = "parent")
public class ParentDocument {
    @Id
    private String id;
    
    @Field("dynamicFields")
    private Map<String, Object> dynamicFields;
    
    // getters and setters
}

@Document(collection = "child")
public class ChildDocument {
    @Id
    private String id;
    
    @Field("name")
    private String name;
    
    // getters and setters
}

@Document(collection = "parent")
public class ParentDocument {
    @Id
    private String id;
    
    @Field("dynamicFields")
    private Map<String, Object> dynamicFields;
    
    @DBRef
    private List<ChildDocument> children;
    
    // getters and setters
}

@Autowired
private MongoTemplate mongoTemplate;

public void saveParentDocument(ParentDocument parentDocument) {
    mongoTemplate.save(parentDocument);
}

public ParentDocument findParentDocumentById(String id) {
    Query query = new Query(Criteria.where("id").is(id));
    return mongoTemplate.findOne(query, ParentDocument.class);
}