Why isn't Google Indexing Discourse? SEO concerns

[Jagster (Jakke Lehtonen)]

Can it be done this way?

Search engines now blocked from indexing non-canonical pages

Important Following further investigation we decided to leave non canonical indexing enable, see more details at: Search engines now blocked from indexing non-canonical pages - #30 by sam

original announcement

Discourse will now reply with a X-Robots-Tag: noindex header when the requested page isn’t the canonical page for a resource. While Discourse uses an automatic scrolling design for both topic lists and topics, this isn’t what we show search engine crawlers, like GoogleBot. Se…

Or using plugin, as one dev told me — for me she’s asking to high price, though. Or using Varnish instead?

I really don’t know anything else that is told to me. All I know for sure is noindex is right now harming SEO on my forum.