How to use EditScript during import into TM?

I'm struggling to find any sensible documentation or examples of EditScript usage.
It's intended for use during import into TM... at least it seems...

There is a mention about it in the Studio 2015 (!!!) TM API documentation ( - check the bottom right of the API schema) and one can find the EditScript related stuff partially documented in the TM API, but there is not a single word anywhere about how to use it - what the script actually is, how it works, what are the EditActions, what should be their format (there are also Load and Save methods), etc.

What's more, this part of the documentation seems to be completely missing from newer API version documentation - see the screenshots below.

So, is there anyone who can point me to some proper EditScript usage documentation?