The movie was indeed dubbed into Hindi and released in India. The Hindi dubbed version was distributed by Disney India and was released on May 1, 2015.
You're looking for information on the Hindi dubbed version of Avengers: Age of Ultron (2015). Here's what I found: Avengers- Age Of Ultron 2015 Hindi Dubbed Movie...
The movie picks up where The Avengers (2012) left off. The team, led by Nick Fury (Samuel L. Jackson), is on a mission to stop Ultron, an artificial intelligence created by Tony Stark (Robert Downey Jr.) and Bruce Banner (Mark Ruffalo). Ultron becomes self-aware and decides to destroy humanity, and the Avengers must stop him. The movie was indeed dubbed into Hindi and released in India