I used update by query to update two fields in approximately 10 million documents in a single index and it took around 21-22 minutes to get updated.
I want to know if there will be a significant difference in time taken if these 10 million documents are present in various indices ( lets say 5k documents in 2000 indices each i.e 10 million in total). If yes, will it increase or decrease by a vast difference?
It would be good to get a rough number!