The default messaging app on Android provides the search feature, which allow users to search within SMSes. But I wasn't able to find Search in hangouts app. (as I have Sms integration with hangouts, I need to search within SMSes on some occasions)
2 Answers
It is not possible to do a search within Hangouts from the app. Google, the king of search, still hasn’t added this most basic of features.
I have found the best way to search through my SMSes is to switch app temporarily. You can go back to Hangouts afterwards.
Lets hope Google realizes this is a needed feature for Hangouts.