My co-worker and I are using RH2017, version 220.127.116.114, to create separate projects. We're using the Indigo layout with very similar customizations to create a unified look for the online help across our company's diverse products. We're both finding that the Index filter doesn't return sub-key items. I've attached screenshots from the generated help from both projects -- first of the index without filtering, then filtered for a sub-key item.
I don't think that's new - I'm getting the same behavior in HTML5 help created in RH11 - that "Filter Keywords" bit isn't like a search, it's a matching engine - trying to narrow down the options as you type.
Huh, I thought I did that last night using RH2017 and it filtered the sub-keys correctly (and I was surprised because I thought it didn't). Although I did have weird results with the help not loading for IE11 or Chrome, but working in FF. So maybe there's a browser component coming in to play?