assertEquals(doc2, qrList.get(0));

        qrList.clear();
        assertEquals(0, qrList.size());
        assertTrue(qrList.isEmpty());
    }

    @Test
    public void test_listOperations_subList() {
        List<Map<String, Object>> documentList = new ArrayList<>();
        for (int i = 0; i < 5; i++) {
            Map<String, Object> doc = new HashMap<>();
            doc.put("title", "Doc" + i);