Update by query performance in single index vs multiple indices

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!

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