Sajjan Singh Rangroot (2018) is based on Sikh regiments serving in the Indian Expenditionary Force that went to the front lines during World War I. Sajjan Singh, a polo aficionado, was a British Indian Army officer and Maharaja of Ratlam State, ruling from 1893-1947. He served on the Western Front during WWI.
Here are a few stills from the movie:
The movie was released on 23 March 2018 and is expected to be dubbed into Hindi and English. You may be able to see it in your local theater.