A executive Producers role varies from project to project.
From Wikipedia:
He could just be a name on the paper or he could actually be involved with the creative work on the film.
From Wikipedia:
So we really have no idea of George's involvement in Indy 5."In films, an executive producer finances the film or participates in the creative effort, but does not work on the set. His/her responsibilities vary from funding or attracting investors into the movie project to legal, scripting, marketing, advisory and supervising capacities."
He could just be a name on the paper or he could actually be involved with the creative work on the film.