@Override
    public Optional<IndexSetConfig> get(String id) {
        return get(new ObjectId(id));
    }
@Test
    public void getReturnsAbsentOptionalIfIndexSetConfigDoesNotExist() throws Exception {
        final Optional<IndexSetConfig> indexSetConfig = indexSetService.get(new ObjectId("57f3d3f0a43c2d595eb0a348"));
        assertThat(indexSetConfig).isEmpty();
    }