What species is it?
Looks like a type of legume called a senna, though I do not know for certain which species -- see below for a pretty good guess!
Things that stand out about your specimen: Most prominent are the erect/many-flowered yellow inflorescences, which are called racemes. You can see narrow green seed pods below your inflorescences as well -- these appear to be winged. Also noteworthy are the pinnately compound leaves with opposite leaflets having emarginate tips and entire margins -- I count 18-22 leaflets on leaves in your second image.
One such species that matches your specimen pretty well is Senna alata, the candelabra bush.
Credit: Marie Lacouture ; Source: TRAMIL Library
- This is a shrub-like plant growing 3-4 m tall, has bright yellow racemes that open bottom to top in the fall, leaves with 18-28 entire leaflets that can sometimes have emarginate tips, and is in-fact named for its winged seedpods (ala = winged).
Although native to the Neotropics, iNaturalist shows many observations of this plant in India.