Document doc = document(
    keys("comments"), 
    values(asList(
            document(keys("content", "date"), values("test1", date("14/01/2011"))),
            document(keys("content", "date"), values("test2", date("12/01/2011"))))));

Of cource it was refactored to:
private Document comment(final String content, final String dateStr) {
    return document(keys("content", "date"), values(content, date(dateStr)));
}

Document doc = document(
    keys("comments"), 
    values(asList(comment("test1", "14/01/2011"),
                  comment("test2", "12/01/2011"))));