This flow using Wait processor to wait for the all split FlowFiles to be processed. When it runs, following log messages can be seen:
2019-04-05 10:02:58,752 INFO [Timer-Driven Process Thread-7] o.a.nifi.processors.standard.LogMessage LogMessage[id=eafe4890-0169-1000-9927-a81fbbafafc6] Processing 1/5 message for 875bd765-209d-4136-a75d-5d14241384fe
2019-04-05 10:02:58,769 INFO [Timer-Driven Process Thread-3] o.a.nifi.processors.standard.LogMessage LogMessage[id=eafe4890-0169-1000-9927-a81fbbafafc6] Processing 2/5 message for 875bd765-209d-4136-a75d-5d14241384fe
2019-04-05 10:02:58,770 INFO [Timer-Driven Process Thread-3] o.a.nifi.processors.standard.LogMessage LogMessage[id=eafe4890-0169-1000-9927-a81fbbafafc6] Processing 3/5 message for 875bd765-209d-4136-a75d-5d14241384fe
2019-04-05 10:02:58,770 INFO [Timer-Driven Process Thread-3] o.a.nifi.processors.standard.LogMessage LogMessage[id=eafe4890-0169-1000-9927-a81fbbafafc6] Processing 4/5 message for 875bd765-209d-4136-a75d-5d14241384fe
2019-04-05 10:02:5