You can't OPEN a PDF file in InDesign. This has never been possible.
You can PLACE a PDF file. A placed PDF is treated as a graphic, you cannot edit it. If you choose Import Options, you can choose which page(s) of the PDF to place.
There are two commercial plugins, PDF2ID and DTP2ID that will open PDF in InDesign, but ID does not have the ability to do it natively.