Convert a DND5E (2014) Adventure to a DND5E (2024) Adventure

So I poked around on the web and mostly found that looks like there is no ""Official" Conversion document.
Am I correct in that assumption? I did find the 5.2.1 SRD.
Anyone have or know of a good "Conversion" document?

There's a blogpost on Updating Your Campaign to the 5.5e D&D Rules | Dungeons & Dragons. The Monster Manual offer guidelines for Monster Conversions as well.

When using a published adventure, simply using 5.5E version of monsters, traps, magic items etc whenever possible should cover most base. The rest could use minor adjustment if needed. 

Generally the conversion process is "no conversion needed" -- you can just use the 2014 stat blocks and everything. This will tend to make the adventure somewhat easier because both characters and monsters in 2024 are a bit more powerful, but it's not all that dramatic.

If you find its too easy just add 1 or 2 enemies per encounter  to whatever is contained in the adventure - its not just the hp its the action economy - the decision points do they focus do they not etc just that 1 simple tweak can up the intensity without any real effort on your part. 

I've run 2014 adventures with 2024 rules and vice versa. There's really minimal difference.

Swapping out the monsters isn't too much of an issue, and there is a table in the back of the 2024 Monster Manual that tells you what has been changed for what. It doesn't upset the balance of most games, and you can always just modify the encounters a little bit to suit the difficulty level you want. I still use the 2014 guidelines for building monsters and it doesn't really hurt anything, so it shouldn't matter too much.