code: String processArg(String[] path, String jsonArg) {
  		String keyArg = jsonArg;
  		if (path.length > 0) {
  			try {
  				keyArg = processSubFieldsOfArg(path, jsonArg);
  			} catch (Throwable ex) {
  				logger.warn("Fail to access to field for '{}'", jsonArg, ex);
  			}
  		}
  		return keyArg;
  	}
docs: Extract considerate value from json arg for compute cache key and function of key<br>
  Example : if key = "a.i" and jsonarg = {\"i\":5} then return 5
  
  @param path
  @param jsonArg
  @return