Regarding CSAR assets, sure there are some capabilities there, though there is no land war for Russia in Syria (but mostly air ops) and no massive land forces are present. But it's not a matter of CSAR in this particular case. The pilot just preferred not to be captured by those f-jackals, who would then film how they would humiliate, etc., bargain about the price to return him and so on. Even if special forces were just 500 m away, jihaddists would anyway take him as he landed "on their heads".Therefore he preferred to die in dignity in combat and he should be greatly respected for that.
Coming back to CSAR, his body was already transported yesterday here, to Moscow region. The body was quickly retrieved by the russian special forces with the help of turks.
Some Su-25 fragments were collected as well, perhaps to identify what exactly MANPAD was used.