[midPoint] Appropriate exception for temporary error in rest connection

[Ethan Kromhout]

We have a REST service that I have written a connector for based on the 
Polygon AbstractRestConnector. The REST service is somewhat unstable, 
throwing 500 errors a few times a day. Whenever this happens, the task 
doing synchronization on the resource gets marked as suspended. From 
what I see in the AbstractRestConnector, the connector is probably  
throwing a ConnectorException then these 500 errors occur.

I want to catch these errors, and throw an exception that indicates to 
task that although this run failed, the task shouldn't suspend because a 
future run may be successful. Would someone be able to tell me a good 
exception to throw for this outcome? I thought perhaps 
RetryableException but am unsure.

Thanks,

Ethan