@Deprecated // TODO: Remove on Vespa 9
    public void createRequestMapping(Inspector inspector, Map<String, String> map, String parent) {
        try {
            new Json2SingleLevelMap(new ByteArrayInputStream(inspector.toString().getBytes(StandardCharsets.UTF_8))).parse(map, parent);
        } catch (IOException e) {
            throw new RuntimeException("Failed creating request mapping for parent '" + parent + "'", e);
        }
    }
Add properties POSTed as a JSON payload, if any, to the request map
container-search/src/main/java/com/yahoo/search/handler/SearchHandler.java