Please correct me if I'm wrong but you have the structure below:
Users --send request --> ELB (with SSL certificates imported from ACM) -- redirect to --> PrestaShop instance
If you configure your ELB so it redirect every request (both using HTTP or HTTPS) to Prestashop via HTTP, you won't need to use the certificates available on the Bitnami Stack and you'll avoid to use them. This is the scenario I propose:
Users -- HTTPS REQUEST --> ELB -- redirects to HTTP --> PrestaShop instance
Your ELB will act as a Proxy that handles the SSL certificates.
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