Is number of documents in an Index is proportional to store.size or

GET /<index>/_count gives me the total number of documents in an index.
GET /_cat/indices/<index> gives me both total documents, store.size and
Say if I have an index with 1 primary and 1 replica.

say my store.size is 600gb, is 300gb. and total number of documents is 9000.

If I am trying to get an estimation of number of documents to storage in my cluster.
Should I consider 9000/300 as the average document size or 9000/600 as the average document size.

I am guessing it should be the But I would like to get a confirmation.
Thanks in advance.

Yes, it's the as store.size includes replicas.

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