Specifies the cluster auto-delete schedule configuration.
Either the exact time the cluster should be deleted at or the
cluster maximum age.
Optional. The lifetime duration of cluster. The cluster will
be auto-deleted at the end of this period. Minimum value is 10
minutes; maximum value is 14 days (see JSON representation of
Duration <https://developers.google.com/protocol-
buffers/docs/proto3#json>__).