All movies have different themes, and Moana is no different. Moana is set in a Pacifica setting, but it was created by Western people.
As an example of a theme, there's a strong theme of knowing who you are in Moana. This is expressed pretty clearly in the song "I Am Moana":
But that's just one theme; I'd expect a good answer to identify and address several themes in the movie. Do these themes reflect Western ideologies, tropes, and culture, or are these themes reflective of the Pacifica culture?