throwError.accept(messages -> fessConfig.invalidIndexRequiredFields(doc)
                        .stream()
                        .forEach(s -> messages.addErrorsPropertyRequired("doc." + s, s)));
            }

            if (!fessConfig.validateIndexArrayFields(doc)) {
                throwError.accept(messages -> fessConfig.invalidIndexArrayFields(doc)

     * </pre>
     * @param property The property name for the message. (NotNull)
     * @param arg0 The parameter arg0 for message. (NotNull)
     * @return this. (NotNull)
     */
    public FessMessages addErrorsPropertyRequired(String property, String arg0) {
        assertPropertyNotNull(property);
        add(property, new UserMessage(ERRORS_property_required, arg0));
        return this;
    }

    /**