}
        return fieldSet;
    }

    default boolean validateIndexDateFields(final Map<String, Object> source) {
        return invalidIndexDateFields(source).isEmpty();
    }

    default List<String> invalidIndexDateFields(final Map<String, Object> source) {
        return split(getIndexAdminDateFields(), ",").get(

                        .forEach(s -> messages.addErrorsPropertyTypeArray("doc." + s, s)));
            }
            if (!fessConfig.validateIndexDateFields(doc)) {
                throwError.accept(messages -> fessConfig.invalidIndexDateFields(doc)
                        .stream()
                        .forEach(s -> messages.addErrorsPropertyTypeDate("doc." + s, s)));
            }
            if (!fessConfig.validateIndexIntegerFields(doc)) {