How to Automatically Index a Large Number of Documents in M-Files?

By "index" do you mean metadata extracted from the document and applied, yes?  Not full-text-indexed for searching or similar, but automated bulk metadata extraction and application?

Thank you for your response.
To clarify, what I mean is that the system should be able to recognize the data inside the document and automatically populate the corresponding metadata fields.
This is the type of automated indexing I’m referring to.
I appreciate your help and guidance.

This is one of the scenarios that "Aino metadata at scale" is looking to help with.  I need to connect with the appropriate product manager to get some more details for you, but what is the timeframe on this work?

Aino Metadata Agent at Scale is one of the topics covered in our Product Update Webinar in early December. Be sure to register to hear more!