Where does the search service expect to build its index?

I installed SP 2013 on a non-system drive.

When I installed SP 2007 and 2010, I also had to specify that logs and search indexs were to be built on the non-system drive, but it was really simple - just a few mouse clicks - to do so.

When I am installing the SP 2013 search service, I don't see any way to modify the topology so that I can specify that the index should be built on the non-system drive.

When I try searching the web, I see various powershell scripts of 20-40 lines of code that claim to be needed to do this.

Surely I am missing something obvious.

It seems so obvious to me that if I install SP 2013 on a D: drive, then the D: drive should be where logs and indexing goes - and if I want it on a different non-system drive, there should be a simple way to accomplish that.

I am hoping that my searches have once again led me astray, missing the simple answer.

Can someone help me find the simple way to accomplish there?

Thank you!