assertNotNull(outputStream);
        assertTrue(outputStream instanceof ByteArrayOutputStream);
    }

    @Test
    public void test_getXContentString_success() {
        // Test that getXContentString method exists and handles exceptions properly
        ToXContent xContent = new ToXContent() {
            @Override
            public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {

     * @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) {

                        Map.of("f", field, "v", value)));
        try {
            final String source = SearchEngineUtil.getXContentString(request, XContentType.JSON);
            if (logger.isDebugEnabled()) {
                logger.debug("update script by id: {}", source);
            }