I realize that the ideology system is due to get an overhaul as a part of GC4 NEXT however in case the existing perks will still be used I thought it would be no harm in raising awareness.
The eureka perk states "approval boost after discovering new technology and +30 research". I was researching armed shuttles at the time (which required less than 30 research to complete). When I picked the I got the +30 research completing armed shuttles however the approval rating on my capital (I only have 1 core world at the moment) remained the same. I moused over each citizen and didn't see indication of a new approval boost.
I can provide a saved file if necessary.