Thank you for contacting Aspose support.
I am afraid, if you going to create a searchable PDF from a scanned PDF (image) you have to use the suggested workaround for it. Moreover, the workaround requires two Aspose products, that is; Aspose.OCR to perform the OCR on the image, and Aspose.Pdf to inject the text (recognized by Aspose.OCR) into a PDF file.
If you wish to give the products a try, please download
the latest releases of both APIs, and feel free to write back in case you need our further assistance.