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 {

                        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);
            }