Configuration to maximize resoration performance

Hi everyone,
I have actually setup elasticsearch on an ec2 instance, I currently have 16 cores, 32GB of ram and for the storage I use an gp3 EBS volume of a 1TB but the problem is the next:

I need to restore a massive amount of backups from an S3 Bucket (maybe 500tb), and when I start a snapshot restoration, it take around 3 hours for a snapshot of 400gb...
When I check the core usage with htop it only use aroud 3 percent of a core and 10gb of ram for the entire instance.

I'm trying many options but my CPU is never used

How can I give all the power of the instance to elasticsearch ? And if possible, how can I optimize the restoration speed ?

Thank's everyone by advance.
Guillaume

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