@Override
    public void reset() {
        final StoredErrorStats storedErrorStats = statsMap.get(Severity.FATAL_ERROR);
        if (storedErrorStats != null) {
            storedErrorStats.reset();
        }
    }
Flags records that contain errors so that the RecordOutputFilter can exclude
them from the output.
stroom-pipeline/src/main/java/stroom/pipeline/errorhandler/RecordErrorReceiver.java