code: private void mergeDocs(Hints hints) {
          if (docs != null) {
              if (hints.getDocs() != null && !docs.equals(hints.getDocs())) {
                  throw SeedException.createNew(RestErrorCode.CANNOT_MERGE_RESOURCES_WITH_DIFFERENT_DOC)
                          .put("oldDoc", docs).put("newDoc", hints.getDocs());
              }
          } else {
              this.docs = hints.getDocs();
          }
      }
docs: Merges docs. If the other resource has a different docs link, it throws a {@code SeedException}.
  
  @param hints the hints to merge