start is the number representing the first replica's index.
It may be used to number replicas from an alternate index (eg: 1-indexed) over the default 0-indexed names, or to orchestrate progressive movement of replicas from one StatefulSet to another.
If set, replica indices will be in the range:
[.spec.ordinals.start, .spec.ordinals.start + .spec.replicas).
If unset, defaults to 0.
Replica indices will be in the range:
[0, .spec.replicas).
StatefulSetOrdinals describes the policy used for replica ordinal assignment in this StatefulSet.