Infer aws_instance.associate_public_ip_address from the presence of a network interface association.

builtin/providers/aws/resource_aws_instance.go

@@ -498,6 +498,7 @@ func resourceAwsInstanceRead(d *schema.ResourceData, meta interface{}) error {
 			if *ni.Attachment.DeviceIndex == 0 {
 				d.Set("subnet_id", ni.SubnetId)
 				d.Set("network_interface_id", ni.NetworkInterfaceId)
+				d.Set("associate_public_ip_address", ni.Association != nil)
 			}
 		}
 	} else {