ID Mask in 2.8

How to use material index? I can’t find the Index input.

For Cycles, it is obsolete since Cryptomatte support.

Unfortunately, Cryptomatte is not available for EEVEE. And material index pass was not restored for EEVEE by lack of time.

I need it in Cycles. The problem is I making lamp. This is a transparent object. I can’t separate the light out of the glass.

I made a mistake.

Material Index Pass is still there for Cycles.
Into Passes panel, it is under Data subpanel.