Indexing Services on 8.5

I have an application built in Windows 2003, and now I'm shifting it over to 2012. It's on IIS 8.5.

I built a search engine in Classic ASP using Indexing Services available in Windows 2003, as I required a function that could search through a folder of documents (PDF and Word Documents).

I realized there's no more indexing services in the new Server. Does anyone have any suggestion on what is available on 2012, and what kinda code can I use to build up an index?