assertEquals("alerts", fields[0]);
        assertEquals("roles", fields[1]);
    }

    public void test_indexAdminDateFields() {
        String[] fields = fessConfig.getIndexAdminDateFields().split(",");
        assertEquals(3, fields.length);
        assertEquals("expires", fields[0]);
        assertEquals("start_time", fields[1]);
        assertEquals("end_time", fields[2]);
    }

                .collect(Collectors.toList()));
    }

    String getIndexAdminDateFields();

    default Set<String> getIndexAdminDateFieldSet() {
        @SuppressWarnings("unchecked")
        Set<String> fieldSet = (Set<String>) propMap.get(INDEX_ADMIN_DATE_FIELD_SET);
        if (fieldSet == null) {
            fieldSet = split(getIndexAdminDateFields(), ",")