A4s nut flush paired vs raise

partypoker - $1 NL FAST (6 max) - Holdem - 6 players
Hand converted by PokerTracker 4

BTN: 91 BB (VPIP: 100.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 1)
SB: 721.9 BB (VPIP: 50.00, PFR: 0.00, 3Bet Preflop: 0.00, Hands: 2)
BB: 187.36 BB (VPIP: 25.84, PFR: 21.18, 3Bet Preflop: 11.30, Hands: 6,193)
UTG: 59.38 BB (VPIP: 0.00, PFR: 0.00, 3Bet Preflop: -, Hands: 1)
Hero (MP): 101.5 BB
CO: 100 BB (VPIP: 20.06, PFR: 16.70, 3Bet Preflop: 7.13, Hands: 14,186)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has A♥ 6♥

fold, Hero raises to 2 BB, fold, BTN calls 2 BB, fold, fold

Flop: (5.5 BB, 2 players) T♥ J♦ J♥
Hero bets 2.61 BB, BTN raises to 5.22 BB, Hero calls 2.61 BB

Turn: (15.94 BB, 2 players) 8♦
Hero checks, BTN bets 11.36 BB, Hero calls 11.36 BB

River: (38.66 BB, 2 players) 4♥
Hero checks, BTN bets 27.54 BB, Hero raises to 82.92 BB and is all-in, fold

is river too thin? he can imo have plenty of Jx that call.