as you can see from the link Always Encrypted columns aren't currently supported by Azure AI Search indexers.
but we can find a workaround for this
- For copying encrypted data between tables without decrypting it, Always Encrypted provides the “Allow Encrypted Value Modifications” switch. This option lets applications move encrypted data between databases without extra overhead or security risk
- This switch can be implemented via the AllowEncryptedValueModification flag in the SQL Bulk Copy API or the ALLOW_ENCRYPTED_VALUE_MODIFICATIONS user option
- Using this approach, Always Encrypted should be disabled for both the source and target database connections to ensure the data remains encrypted during the copy
you can use Azure Data Factory to create ETL workflows and the n you can encrypt data on Azure AI Search by using
Customer-Managed Keys (CMK)