The helper in question is supposed to spawn a background fiber with
tablet migration stage action and repeat it in case action fails (until
operator intervention, but that's another story). In case action fails
a message with ERROR level is logger about the failure.
This error confuses some tests that scan scylla log messages for
ERROR-s at the end, treat most of them (if not all) as ciritical and
fail. But this particular message is not in fact an error -- topology
coordinator would re-execute this action anyway, so let's demote the
message to be WARN instead.
refs: #17027
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
Closesscylladb/scylladb#17568
ca8bfed8e6