Error log to verbose in AbstractParallelEoSStreamProcessor

[bmaggi]

Hi,

Context is pretty big and lead to an enormous log for this code which will be truncated in some tooling:

            String msg = msg("Exception caught in user function running stage, registering WC as failed, returning to" +
                    " mailbox. Context: {}", context, e);
            if (cause instanceof PCRetriableException) {
                log.debug("Explicit " + PCRetriableException.class.getSimpleName() + " caught, logging at DEBUG only. " + msg, e);
            } else {
                log.error(msg, e);
            }

I would be nice to have a
smaller toString for the context

Regards
Benoit