autoMinorVersionUpgrade
Specifies whether minor version upgrades are applied automatically to the DB instance during the maintenance window. An outage occurs when all the following conditions are met:
The automatic upgrade is enabled for the maintenance window.
A newer minor version is available.
RDS has enabled automatic patching for the engine version.
If any of the preceding conditions isn't met, Amazon RDS applies the change as soon as possible and doesn't cause an outage.
For an RDS Custom DB instance, don't enable this setting. Otherwise, the operation returns an error.