docs: public void retrieveContents(List<Document> documents) {
          for (Document doc : documents) {
              if (doc.getBody() == null) {
                  List<String> body = broker.callRPCList("TIU GET RECORD TEXT", null, doc.getId().getIdPart());
                  doc.setBody(StrUtil.fromList(body));
              }
          }
      }