@DavidTurner Thank you for your quick response.
We have run the backup and restore in the same lab. The storage class and everything else, while restoring the data, is the same as it was when we took the backup.
How can the backup content change? What could be the possible reasons behind that? Any possible workaround that can help us restore this data?
Also, could you please guide me to any elesticsearch documentation that talks on this topic?