@RequestMapping(method = RequestMethod.GET)
public Page<Product> find(
  @PageableDefault(sort = "id", direction = DESC) final Pageable pageable,
  @RequestParam(required = false) final String nameLike,
  @RequestParam(required = false) final Long priceFrom,
  @RequestParam(required = false) final Long priceTo,
  @RequestParam(defaultValue = "true") final boolean inStock,
  @RequestParam(required = false) final Set<String> categoriesIn) {

  final Specifications<Product> specifications = SpecificationBuilder.where(stockAvaiable(inStock))
    .and(nameLike, StringUtils::isNotEmpty, ProductSpecifications::nameLike)
    .and(priceFrom, Objects::nonNull, ProductSpecifications::priceGraterThanOrEqualsTo)
    .and(priceTo, Objects::nonNull, ProductSpecifications::priceLessThan)
    .and(categoriesIn, CollectionUtils::isNotEmpty, ProductSpecifications::categoriesIn)
    .build();

  return repository.findAll(specifications, pageable);
}