ES stands for Environmental Smash, which is any grab that makes use of the walls/objects. i don't know if the "kick the victim into a group of enemies" counts, but i think it's a safe bet that it does. counter doesn't go up until you relog, which is an irritating bug.
I'm certain any grab + smash works, even the normal one where you do the backbreaker. I have all the grab titles and I almost never bother to walk them to a wall, cliff, or object/enemy. There is no way I have all those titles if those backbreakers didnt count.