It’s simple, yet not very obvious. All you have to do is to change the normal behavior of the commas you use in the Where function to act as an OR. You’d do it like this:-
ObjES.Query.es.DefaultConjunction = esConjunction.Or;
ObjES.Query.Where(<<Go ahead with using the commas that usually defaults to an AND conjunction>>);
oh and I almost forgot to mention my colleague Bilal mentioned this to me. So special thanks to him as well.