As top agency, ISI might have been in touch and should. But not to the extent these claims say. There is a whole lot of stuff mossad has done for India, they are giving them sophisticated technology. Similarly ISI have worked with CIA for long, in Afghanistan, though CIA doesn't like the outcome now.
I personally have no problem in having some relations with Israel but its almost impossible for any political party or army to recognize Israel. It will be a suicide and the term yahoodi agent will be labelled permanently on anyone who did it.