There is no field in the database that specifies whether or not the film was produced in Bollywood.
To try to resolve your issue, the best filter I know is the with_original_language
In this case it would be &with_original_language=hi https://api.themoviedb.org/3/discover/movie?api_key=[MY_KEY]&language=hi-IN®ion=IN&sort_by=popularity.desc&page=1&primary_release_year=2018&with_original_language=hi
But, I do not know if all the films produced in Bollywood have their original language as Hindi.
In addition to other languages in India, it is also possible for Bollywood to produce in English.
In addition, Indian movies that have been placed here on TMDb for a long time may not be in the correct original language.
I do not know since when TMDb supports the Hindi language.
Therefore, only you, who must be or live in India, can evaluate.
Reply by ticao2 š§š· pt-BR
on April 5, 2019 at 10:31 PM
There is no field in the database that specifies whether or not the film was produced in Bollywood.
To try to resolve your issue, the best filter I know is the with_original_language
In this case it would be &with_original_language=hi
https://api.themoviedb.org/3/discover/movie?api_key=[MY_KEY]&language=hi-IN®ion=IN&sort_by=popularity.desc&page=1&primary_release_year=2018&with_original_language=hi
But, I do not know if all the films produced in Bollywood have their original language as Hindi.
In addition to other languages in India, it is also possible for Bollywood to produce in English.
In addition, Indian movies that have been placed here on TMDb for a long time may not be in the correct original language.
I do not know since when TMDb supports the Hindi language.
Therefore, only you, who must be or live in India, can evaluate.