launchSpecifications

The launch specifications for the Spot Fleet request. If you specify LaunchSpecifications, you can't specify LaunchTemplateConfigs. If you include On-Demand capacity in your request, you must use LaunchTemplateConfigs.

If an AMI specified in a launch specification is deregistered or disabled, no new instances can be launched from the AMI. For fleets of type maintain, the target capacity will not be maintained.