If you read the OP carefully, you will see that this list is not the largest number of searches. Rather these are the searches with the highest growth rates, or at least that is what "highest spike this year compared to last year" suggests.
Bolly is filled with Punjabi/Pathan leading actors, representatives of PK's demographics (60% Punjabi, 20% Pashtun), while being at most 2% in India for Punjabis and few thousands for Pashtuns, ethnic make up which is literally non existent in BD as well, so yeah it's puzzling why it should dominate India/BD.