Try something like this
(index=index1 other parts ) OR (index=index2 other parts)
| eval itemCode=coalesce(item1,item2)
| stats dc(index) as reportedBy by itemCode
| stats count as Count by reportedBy | eventstats sum(Count) as Total
| eval Percent=round(Count*100/Total,2)
| eval ItemType=if(reportedBy=2,"Common in Both Indexes","Unique in Both Indexes")
| table ItemType Count Percent
... View more