I cannot find these chords in my piano chord manual and think they may have alternative notations. What is an Es or As chord?
After doing a little bit of digging, I found a source* that uses the s instead of the full sus symbol to notate a suspended chord. They always put the number next to it, but a sus alone indicates a sus4 so I would imagine that they would be equivalent. I would still like to see the context just to be sure but I think it is pretty likely.
* I don't really like or agree with a good chunk of the notation that this page uses, but shows the possibility of a sus being notated that way.