Microsoft recently launched the alpha version for various countries which also include India. But many users might be thinking about how to get it working as you have just follow few steps to make it work
Step 1:Go to Settings> Region>India
Step 2: Again in the setting >Keyboard >English (India)
Step 3: Now in speech in the settings menu go for English (United States)
Now open Cortana from tile or by pressing search button for 2 sec.