docs: protected Configuration freemarkerConfig() {
          if (fmConfig == null) {
              fmConfig = new Configuration(Configuration.VERSION_2_3_26);
              fmConfig.setClassLoaderForTemplateLoading(
                  contentLoader, contentPath);
              fmConfig.setDefaultEncoding("utf-8");
              fmConfig.setTemplateExceptionHandler(
                  TemplateExceptionHandler.RETHROW_HANDLER);
              fmConfig.setLogTemplateExceptions(false);
          }
          return fmConfig;
      }