esdsl/SortCombinations not available in 8.18, only in 9.0

[agnivade]

This PR (#968) changes the sort API to use SortCombinations, but it's difficult to use the API without having the file (typedapi/esdsl/sortcombinations.go) which was added in 9.0 (#995). To make it work, I've had to copy the file locally.

I am not sure if this was intentional or not. But it certainly makes like difficult to make such breaking changes in minor versions.

[ISim]

I'm struggling with the same issue - the upgrade go-elasticsearch from 8.17 to 8.18 breaks my code.

I use typed api and Sort method now accepts (sorts ...types.SortCombinationsVariant).
I cloned this repo (because github denied to show whole typedapi/types directory due to limitation to 1000 files in directory) and I tried to find what type should I use for sorting. And unless I'm mistaken, there is no type that implements this interface in 8.18 codebase.