I cannot find these chords in my piano chord manual and think they may have alternative notations. What is an Es or As chord?
I agree that it's probably a sus4 chord, but if it's hand-written, could the "s" possibly be a "5" and it's a power chord? Only other kind of far-out thought...
Is this handwritten or printed? Is the notation of German origin? In German, the notes E flat and A flat are called Es and As.
Could it maybe be German (or Dutch)? Because in this case it would mean Eb and Ab (i.e. E flat and A flat). And in this case 'Es' would refer to an Eb major triad, and 'As' refers to an Ab major triad.
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.