Distinguish regular indices from searchable snapshot indices in get-snapshots API #109956
Description
A snapshot of a searchable snapshot index is just a pointer to the snapshot holding the actual index data, unlike snapshots of regular indices which contains the index data itself. Some users have reported confusion about this. It'd be useful if we distinguished these two kinds of index in the get-snapshots API, and even more useful if we could also indicate in the API response the location of the actual data.