clusterResetAction() {
    return 'no-op: this route is deprecated and has been kept for backward-compatibility only. To reset a cluster, simply use "admin:shutdown" and then restart Kuzzle nodes';
  }
@deprecated - added for backward compatibility only

This action originally "resets" the cluster state
This was only (somewhat) useful in development environments, or as a
dirty workaround to desyncs, and this makes no sense with the new cluster
architecture, since 1/ the state is guaranteed to be synchronized, and
2/ the state is now completely volatile: restarting the whole cluster at
once (e.g. using "admin:shutdown" and then restarting nodes) will
effectively force the cluster to have a blank state (the old cluster stored
its state in redis, hence this API action).

@return {string} deprecation notice