Yes its true.
Jamnagar Air Base: 12 December 1971, 1402 hours: Two MiG-21FLs at the ORP (Operational Readiness Platform) are scrambled to set up a CAP (Combat Air Patrol) at 3 km (10,000 feet) over the airfield. Minutes earlier, Mobile Observation Posts along the Saurashtra sea coast had reported two bandits flying low, crossing the coast line in the general direction of Jamnagar, with its vital air base. Shortly, the airfield is under attack, the bandits (Now identified as F-104A Starfighters) carrying out a front gun attack on aircraft parked near the runway 24/06 dumbbell (which were decoys). The second F-104, spotting the MiG-21s turns off and heads north. The lead F-104 continues at high speed along the runway but as he exits, one of the MiG-21s dives down and positions himself behind, but still above, the F-104, allowing the air defence guns to continue firing. The F-104 clears land, is over the sea, continuing at heading 2400, maintaining very low level and high speed. The MiG-21 drops down behind, to about 100 feet, at 1200 km/hr with full afterburner.
An air-to-air missile (K-13) is launched from the MiG-21 but the F-104 is taking evasive measures, firing flares to misguide the heat seeking missile and the K-13 is deflected away from the intended target. The MiG-21 pilot now selects 'guns' but as he is closing in, the F-104 suddenly pulls sharp to his right in a desperate manoeuvre, perhaps to throw off a second missile. The MiG-21 now rapidly closes distance and from 300 meters, fires three sharp bursts with the GSh-23 cannon at the F-104 which is immediately stricken, pulling up momentarily as it starts to flame and the pilot ejects. The MiG-21 goes fast past and pulls up, its pilot turning around to see the parachute has deployed, the F-104 pilot falling slowly under a bright orange canopy into the Gulf of Kutch a shark infested sea. The MiG-21 pilot circles the engagement area, calls up base to dispatch a rescue launch to the exact spot and them returns back to base.
Wg. Cdr. M.E. Middlecoat SJ, TBT. God bless his Soul he was a good friend and a teacher.