"indispensable features" is correct and usable in written English.
It can be used to refer to essential or necessary aspects of something. Example: "Before purchasing a new car, make sure it has all the indispensable features, such as air conditioning, anti-lock brakes, and good gas mileage."
MIRRORS, curlicue balustrades and hanging flat-panel TVs have become indispensable features on once-drab restaurant terraces on Sukhumvit 3/1, otherwise known as Soi Arab, the colorful pedestrian alleyway on the northern fringe of the Soi Nana night-life area in Bangkok.
The newly developed platform enjoys several indispensable features.
Flood and rice are two indispensable features of Bangladesh landscape, one of the most flood prone countries in the world.
Since, as anticipated, hydrogen bonds are indispensable features in higher-ordered DNA/RNA structures, this hard-argued aspect increases the value of fluoro-modified nucleobases in molecular recognition.
Despite the absence of case endings in the dialects spoken by many of its users, the producers used them and other indispensable features of MSA.
Voice search itself has become one of the more indispensable features in a website, and anyone who can make good use of this trend will probably be ahead of the fray.
All but the Samsung let you dial by voice ("Call Chris") -- an indispensable feature if you drive.
Justice Stevens said the PGA Tour's walking rule was "at best peripheral" and "not an indispensable feature" of golf at any level.
That principle has ever since been respected by this Court and the country as a permanent and indispensable feature of our constitutional system...
That principle has ever since been respected by this Court and the country as a permanent and indispensable feature of our constitutional system..
The rule that golfers must walk, which applies only at top-level tournaments, is "at best peripheral" and "not an indispensable feature" of the game at any level, he wrote.
