мой API продолжает возвращать ноль из столбца mongoDB, где существуют данные

Question

API загрузки My Spring для извлечения списка всех учетных записей портала по appCode из моего mongoDB возвращает null (где данные существуют в БД) для некоторых полей, как мне получить данные null?

Это часть моей коллекции БД

{"_id":"5d927f14c61810332425ee7f","portalAccount":{"_id":"5d927f13c61810332425ee7d","name":"Codelab2","dateCreated":"2019-09-30T22:17:55.929Z","code":"CL-ACCT-   2","status":"ACTIVE","accountType":"CODELAB"},"portalUser":{"_id":"5d927f14c61810332425ee7e","username":"iyke","password":"$2a$10$29j8SONBRdqGtYUtonJ9bulmdiPhUiyB5kj9sZHK.zICnXkh3YlA6","lastName":"Ezugworie","firstName":"Ikechukwu","email":"i.ezugworie@gmail.com","resetPassword":true,"failedLoginAttemptsSinceLastSuccessful":"0","locked":false,"dateCreated":"2019-09-30T22:17:55.933Z"},"status":"ACTIVE","role":{"_id":"5d8f7a58c6181021c820afc9","name":"ADMIN","status":"ACTIVE","permissions":[{"name":"CREATE_APP","status":"ACTIVE"}]},"app":{"_id":"5d8f7a57c6181021c820afc8","name":"Codelab Account","code":"CL-001","description":"Account App for Codelab","status":"ACTIVE","apiKeys":[{"key":"2FCUSKSHFU===sfsh13Xa","status":"ACTIVE"}]},"_class":"com.codelab.accounts.domain.entity.account.Membership"}

{"_id":"5d927f3bc61810332425ee82","portalAccount":{"_id":"5d927f3ac61810332425ee80","name":"Codelab2","dateCreated":"2019-09-30T22:18:34.895Z","code":"CL-ACCT-   3","status":"ACTIVE","accountType":"CODELAB"},"portalUser":{"_id":"5d927f3bc61810332425ee81","username":"bille","password":"$2a$10$.ERPBlkPF6rPHs1aAV9rpeNodqb83T2M1eI/mweW4zrD9xYDF3NpC","lastName":"Bille","firstName":"Ibinabo","email":"ibille@gmail.com","resetPassword":true,"failedLoginAttemptsSinceLastSuccessful":"0","locked":false,"dateCreated":"2019-09-30T22:18:34.915Z"},"status":"ACTIVE","role":{"_id":"5d8f7a58c6181021c820afc9","name":"ADMIN","status":"ACTIVE","permissions":[{"name":"CREATE_APP","status":"ACTIVE"}]},"app":{"_id":"5d8f7a57c6181021c820afc8","name":"Codelab Account","code":"CL-001","description":"Account App for Codelab","status":"ACTIVE","apiKeys":[{"key":"2FCUSKSHFU===sfsh13Xa","status":"ACTIVE"}]},"_class":"com.codelab.accounts.domain.entity.account.Membership"}

Вот мой контроллер

    public ResponseEntity<?> accounts(@RequestHeader("X-APP-CODE") String appCode,
                                      @RequestParam("limit") int limit,
                                      @RequestParam("offset") int offset) {
       List<PortalAccountDto> portalAccount = accountService.getAllPortalAccount(appCode, limit, offset);
       if ( portalAccount.isEmpty()){
         throw  new NotFoundException("Portal Account with app code "+appCode+ " not found" );
       }
        return ResponseEntity.ok(portalAccount);
    }

Вот мой сервис

 List<PortalAccountDto>
    getAllPortalAccount(String appCode, int limit, int offset);

И мой сервисРеализация

 @Override
    public List<PortalAccountDto> getAllPortalAccount(String appCode, 
                                                      int limit,
                                                      int offset) {
        QPortalAccount qPortalAccount = new QPortalAccount(QPortalAccount.portalAccount);
        QMembership qMembership = new QMembership(QMembership.membership);
        Predicate predicate =  qMembership.app.code.endsWithIgnoreCase(appCode.trim());
        logger.debug("Get all Portal Accounts with limit {} and offset {}", limit, offset);
        Pageable pageable = new OffsetBasedPageRequest(limit, offset);
        return membershipRepository.findByAppCode(appCode, pageable);
    }

И Репозиторий

public interface MembershipRepository extends MongoRepository<Membership, String>, QuerydslPredicateExecutor<Membership>{

    List<PortalAccountDto> findByAppCode(String appCode, Pageable pageable);

}

Ожидаемый результат

[
 {
        "id": "5d927f13c61810332425ee7d",
        "name": "Codelab2",
        "dateCreated": "2019-09-30T22:17:55.929Z",
        "code": "CL-ACCT-   2",
        "status": "ACTIVE",
        "accountType": "CODELAB"
    },
    {
        "id": "5d927f3ac61810332425ee80",
        "name": Codelab2,
        "dateCreated": "2019-09-30T22:18:34.895Z",
        "code": "CL-ACCT-   3",
        "status": "ACTIVE",
        "accountType": "CODELAB"
    }
]

Но фактический результат

[
 {
        "id": "5d927fe0c61810332425ef03",
        "name": null,
        "dateCreated": null,
        "code": null,
        "status": "ACTIVE",
        "accountType": null
    },
    {
        "id": "5d927fe0c61810332425ef00",
        "name": null,
        "dateCreated": null,
        "code": null,
        "status": "ACTIVE",
        "accountType": null
    }
]