Is there any way to find out ES data redundancy coefficient

Hi there.
Trying to count how many HDD do I need for ES cluster.
Here is the couple of related questions:

Is there any way to find out how much HDD space will need ES to store all data with certain index configuration?
How increasing shard count affects to amount of HDD space needed to store index?
Why index that was reindexed to other ES cluster takes more space on destination cluster than in source?

thanks for answers.

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