The migration rewrote a v4 topology into v5 and recovered raft state through
predastore's clusterrun package, which no longer exists. The on-disk layout it
relocated data into has moved too: node directories are now node-<id> under the
host root, with no host-N level. Nothing migrates a pre-cutover install; it is
re-initialised from scratch.
node-reset.sh keeps directories by design, so it now removes the predastore
cluster tree outright rather than leaving the old skeleton standing.
brynmailer-mdc