Why `print(String)` waiting until line-break before printing to console (Kotlin)?

Question

Lets have this code in Kotlin:

fun main() {
    println("Start")
    var i = 1
    while (i <= 10) {
        Thread.sleep(500)
        print("... ")
        System.out.flush() // Suggest from another post, but it not working
        i++
    }
}

Why there is no output in console for 5 seconds and then everything is printed together in one go?

Start
... ... ... ... ... ... ... ... ... ... 

I tried solution from How to make the print method in Kotlin have the same effect as Java, but it does not work.