public List<ParsedTerm> filterElementsContainingUsefulInformation(final Map<String, List<ParsedTerm>> parsedTermsGroupedByField) {
        return parsedTermsGroupedByField.values()
                .stream()
                .map(this::filterElementsContainingUsefulInformation)
                .flatMap(Collection::stream)
                .collect(Collectors.toList());
    }
@Test
    void doesNothingOnEmptyInput() {
        assertThat(toTest.filterElementsContainingUsefulInformation(Map.of()))
                .isEmpty();
    }