doc.put("intStr", "123");
        assertEquals(Integer.valueOf(123), DocumentUtil.getValue(doc, "intStr", Integer.class));

        doc.put("longStr", "123456789");
        assertEquals(Long.valueOf(123456789L), DocumentUtil.getValue(doc, "longStr", Long.class));

        doc.put("doubleStr", "123.45");
        assertEquals(Double.valueOf(123.45), DocumentUtil.getValue(doc, "doubleStr", Double.class));