Hi @Rahman Yoonus if I understand correctly, you want to upgrade from a free to a higher tier? Is there a specific tier you want to upgrade to for Azure AI Search?
Tiers include Free, Basic, Standard, and Storage Optimized. Standard and Storage Optimized are available with several configurations and capacities. The following screenshot from Azure portal shows the available tiers, minus pricing (which you can find in the Azure portal and on the pricing page).
Currently, there's no built-in support to upgrade or downgrade tiers. If you want to switch to a different tier, the approach is:
Create a new search service at the new tier.
Deploy your search content onto the new service. Follow this checklist to make sure you have all of the content.
Delete the old search service once you're sure it's no longer needed.
For large indexes that you don't want to rebuild from scratch, consider using the backup and restore sample to move them.
Please let us know if you have further questions.
-Grace