@PostMapping("/")
    public @ResponseBody
    ResponseEntity filter(@RequestBody DocPerson person) {
        List<DocPerson> people = null;

        if(person.getFirstname() == null) return new ResponseEntity<String>("Firstname required", HttpStatus.BAD_REQUEST);
        if(person.getLastname() == null) return new ResponseEntity<String>("Lastname required", HttpStatus.BAD_REQUEST);
        if(person.getInn() == null) return new ResponseEntity<String>("inn required", HttpStatus.BAD_REQUEST);
        if(person.getFirstname().isBlank()) return new ResponseEntity<String>("Firstname can't be empty", HttpStatus.BAD_REQUEST);
        if(person.getLastname().isBlank()) return new ResponseEntity<String>("Lastname can't be empty", HttpStatus.BAD_REQUEST);
        if(person.getInn().isBlank()) return new ResponseEntity<String>("inn  can't be empty", HttpStatus.BAD_REQUEST);



        try {
            if (person.getPatronymic().equals("")) {
                people = personRepository.findDistinctByInnAndLastnameIgnoreCaseAndFirstnameIgnoreCase(person.getInn(), person.getLastname(), person.getFirstname());
            } else {
                people = personRepository.findDistinctByInnAndLastnameIgnoreCaseAndFirstnameIgnoreCaseAndPatronymicIgnoreCase(person.getInn(), person.getLastname(), person.getFirstname(), person.getPatronymic());
            }
        } catch (Exception e) {
            logger.error(e.toString());
            return new ResponseEntity<List<DocPerson>>(people, HttpStatus.OK);
        }


        return new ResponseEntity<List<DocPerson>>(people, HttpStatus.OK);
    }