* @param mediaType the media type for the conversion
     * @return the string representation of the content
     * @throws IORuntimeException if an IO error occurs during conversion
     */
    public static String getXContentString(final ToXContent xContent, final MediaType mediaType) {
        try {
            return XContentHelper.toXContent(xContent, mediaType, ToXContent.EMPTY_PARAMS, false).utf8ToString();
        } catch (final IOException e) {