Google Voice Search is dead. Cue in somber music.
For many years before Google Assistant was a thing, Android had a microphone you could trigger to perform actions. It had actions such as calls, texts, emails, music back in 2010, more than 10 languages supported way back in 2012, introduced nicknames and relationships such as "mom" and "husband" in 2014, and had multilingual support also in 2014.
Google app kills the last remnants of Voice Search, completely switches to Assistant (Updated) was written by the awesome team at Android Police.