public GatewayInstance withInstanceId(String instanceId) {
        setInstanceId(instanceId);
        return this;
    }
The managed instance ID generated by the SSM install. This will begin with "mi-".

@param instanceId
       The managed instance ID generated by the SSM install. This will begin with "mi-".
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-mediaconnect/src/main/java/com/amazonaws/services/mediaconnect/model/GatewayInstance.java