The instance is meant for development and testing purposes only; it has
no performance or uptime guarantees and is not covered by SLA.
After a development instance is created, it can be upgraded by
updating the instance to type PRODUCTION. An instance created
as a production instance cannot be changed to a development instance.
When creating a development instance, serve_nodes on the cluster must
not be set.
An instance meant for production use. serve_nodes must be set
on the cluster.
The type of the instance is unspecified. If set when creating an
instance, a PRODUCTION instance will be created. If set when updating
an instance, the type will be left unchanged.