Indexing user fields

I know this is not possible out of the box, but could some point me in the right direction of achieving this? A rough outline of how indexing and search works internally now would be great or the documentation?
Thx

It might help to back up a bit and describe the problem you’re trying to solve. Maybe you want to add a model, which lets you add a table that you can include an index in.

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I’m just looking to create a search function for customised user fields in addition to what’s out the box.