Flushing with plain water for the last ten days is standard advice for indica plants grown with bottled nutrients, though the evidence that it changes the smoke is thinner than most people think. Organic soil growers skip it entirely, and blind tests posted over the years have been split. Both sides of the argument, with the actual lab data that exists, are laid out fairly on https://kushindicaseeds.com rather than repeating the usual claims. I still flush out of habit, but I no longer argue with those who do not.
