code: public FessMessages addErrorsDocumentNotFound(String property, String arg0) {
          assertPropertyNotNull(property);
          add(property, new UserMessage(ERRORS_document_not_found, arg0));
          return this;
      }
docs: Add the created action message for the key 'errors.document_not_found' with parameters.
  <pre>
  message: Not found URL of Doc ID:{0}
  </pre>
  @param property The property name for the message. (NotNull)
  @param arg0 The parameter arg0 for message. (NotNull)
  @return this. (NotNull)