I wouldn't say that Hendustan is an extended form when it is clearly a compound name, the second element of which is the Persian suffix ستان (stan) meaning "land of":https://en.wiktionary.org/wiki/Hindustan#Etymology (in English)Also look at how you handled other entries that contain this suffix, such as Kurdistan and Pakistan. [noted -ed]
https://en.wiktionary.org/wiki/Hindustan#Etymology (in English)
Also look at how you handled other entries that contain this suffix, such as Kurdistan and Pakistan. [noted -ed]