Making timelines more resilient to heavy workflow activities

[#1]

Request for Feature Enhancement (RFE) Summary:	Making timelines more resilient to heavy workflow activities.  Currently timelines timeout because the number of nodes that it has to transvers is over the threshold.  We had to purge and reduce our timelines from 30 days to 5 days in order for us to see the timeline results.
Use-case:	We heavy workflows that causes the timelines to transverse over 30,000 and fail to return results.
Current/Experienced Behavior:	We expect the OOTB functionality of timelines should work as expected. Which out create custom indexes
Improved/Expected Behavior:	OOTB indexes should be able used to ensure timeline return in a timely fashion and not timeout.
Environment Details (AEM version/service pack, any other specifics if applicable):	AEM 6.5 SP19
Customer-name/Organization name:	Toyota
Screenshot (if applicable):
Code package (if applicable):