final Map<String, Object> hits = getMapValue(result, "hits");
                if (hits != null) {
                    final List<Map<String, Object>> hitList = getListValue(hits, "hits");
                    if (hitList != null) {
                        for (final Map<String, Object> hit : hitList) {
                            final Map<String, Object> source = getMapValue(hit, "_source");

        final Map<String, Object> result = coordinatorHelper.getMapValue(map, "nested");
        assertNotNull(result);
        assertEquals("value", result.get("key"));
    }

    @Test
    public void test_getMapValue_notMap() {
        final Map<String, Object> map = Map.of("key", "string_value");
        assertNull(coordinatorHelper.getMapValue(map, "key"));
    }

    @Test