Search issues after document with OCR is uploaded

I am extremely new to linux and nextcloud
I am running Nextcloud 17.01
I have installed every search app I could find in the app store.
I cannot search (upper right hand magnifying glass) for anything in the body of any document OCR or just plain text file. Can someone please help me. I am again very green.

have you installed elasticsearch ?

I haven’t is that difficult?

you should find some documentation on the app’s wiki