code: public T one(String id) {
      try {
        return baseQuery().one(id).blockingFirst();
      } catch (NullPointerException e) {
        throw new CDAResourceNotFoundException(type, id);
      }
    }
docs: Fetch and return a resource matching the given {@code id}.
  
  @param id resource id.
  @return result resource, null if it does not exist.