I Dream in Another Language (2017)

An indigenous language is in peril, as its last two speakers had a quarrel in the past and haven't spoken to each other in over 50 years. Martín, a young linguist, will undertake the challenge of bringing the old friends back together and convincing them to speak once again so he can obtain a recorded registration of the language and study it.

Unfortunately the movie I Dream in Another Language is not yet available on HBO Max.