Difference between primary store size and store size

Elastic Stack Elasticsearch
1

Hello everyone,
I am using Elastic search 1.4.2.
I am trying to analyze Elastic Search Space using _cat/indices API.
I see 2 different columns related to disk space, Store Size and Primary store size.
I see that store size (at certain times) is double than primary store size. Why so?

Which size is actually taken by OS for disk space storage?
Can anyone explain?

Appreciate your inputs!

Regards,
Sagar Shah

2

from _cat/indices api help.

store.size | ss,storeSize | store size of primaries & replicas
pri.store.size | | store size of primaries

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