Hijacking Episerver Find's Unified Search Text

I'm going to sort of build onto @kennygutierrez's recent quick-tip post regarding limiting indexing with your developer Find index with a Find tip of my own.

In the past few weeks, I've had a need to inject my own logic into how Find aggregates text for its UnifiedSearch. I won't get into the specifics of what I was doing (it would raise some questions as well as some eyebrows, to be honest), but I'd like to share the solution I found in the Episerver forums (sorry that I didn't save which post and therefore can't credit the poster, though I certainly owe them a drink).

There will only be a couple of short code snippets with this as it's really an elegantly simple, yet quite powerful solution.