docs: private void checkForContextHeadRevision(String contextId, UUID expectedHeadRevision)
          throws EKBConcurrentException {
          if (!Objects.equal(edbService.getLastRevisionNumberOfContext(contextId), expectedHeadRevision)) {
              throw new EKBConcurrentException("The current revision of the context does not match the "
                      + "expected one.");
          }
      }