fun <T> KProperty<T>.geoWithinCenter(x: Double, y: Double, radius: Double): Bson (source)
Creates a filter that matches all documents containing a property with grid coordinates data that exist entirely within the specified circle.
x - the x coordinate of the circle
y - the y coordinate of the circle
radius - the radius of the circle, as measured in the units used by the coordinate system
Return
the filter
Mongodb
.driver.manual reference/operator/query/geoWithin/ $geoWithin
Mongodb
.driver.manual reference/operator/query/center/#op._S_center $center