Applicant manager/get applicant by ID

Getting applicant by applicantID was implemented and new Applicant entity with single field applicantID was added.
Why do you need @Qualifiers It is not good practice to use @Qualifier in production code. And I'm not sure, that you have different implementations of applicantService
The better way, is to use name convention bean name equal field name.
The best way - is to create custom annotation with BeanPostProcessor, but it's too complicated.