engine
The database engine to use for the new instance.
This setting doesn't apply to RDS Custom.
Default: The same as source
Constraint: Must be compatible with the engine of the source. For example, you can restore a MariaDB 10.1 DB instance from a MySQL 5.6 snapshot.
Valid Values:
db2-aedb2-semariadbmysqloracle-eeoracle-ee-cdboracle-se2oracle-se2-cdbpostgressqlserver-eesqlserver-sesqlserver-exsqlserver-web