The 1000 rupees plan which you have mentioned is a top up plan. You will need a base plan on top of this topup. What the plan means is that on recharging with 1000 rupees, you will get 14,074 minutes to make calls to non-jio numbers and a data voucher of 100 GB.
Unlimited validity means that these 14,074 minutes will not have any expiry date as such and you can continue using it till all the minutes get over, provided you have a base plan active.
The data voucher once redeemed will have a validity same as that of the base plan.