Earlier I posted about this curious opening. I thought that it was for compensating lift loss. That belief was lifted from other forum discussions.
This might not be the case.
I think it might just be a bleed air intake. And therefore I correct it -
There is an aviation stackexchange answer that may give some clues -
Wikipedia states, for the F-18 Hornet (which goes through a similar engine and size upgrade from the Hornet to SuperHornet like Tejas Mark 1 to Mark 2)
The engine air inlets of the Hornet, like that of the F-16, are of a simpler "fixed" design, while those of the F-4, F-14, and F-15 have variable geometry or variable air inlets. This is a speed limiting factor in the Hornet design. Instead, the Hornet uses bleed air vents on the inboard surface of the engine air intake ducts to slow and reduce the amount of air reaching the engine. While not as effective as variable geometry, the bleed air technique functions well enough to achieve near Mach number 2 speeds, which is within the designed mission requirements.
THE Turbofan to be used on Tejas Mark 2 is the GE F414 INS6EPE.