What is fiscal impulse? I came across this term in the following paragraph and I could not comprehend what it meant. 


  The new WPI series does not include any indirect taxes, which brings it conceptually closer to the producer prices and also removes fiscal impulse impact
This looks like a quotation from The Indian Express

WPI is likely to mean "Wholesale Price Index", similar to what is sometimes called the "Producer Price Index" and related to GDP deflators, but distinct from the "Consumer Price Index".  

The exclusion of indirect taxes is presumably designed to avoid measuring price changes directly associated with India's introduction of a national Goods and Services Tax in 2017.