private static double nihlakanta(int i) {
        long a = 2 + i * 4L;
        return (24 * (a+2))/(double)(a*(a+1)*(a+2)*(a+3));
    }
Utility expression that will busy-wait the amount of time given in the numeric field.
Non-numeric fields will be ignored.

@author baldersheim
indexinglanguage/src/main/java/com/yahoo/vespa/indexinglanguage/expressions/BusyWaitExpression.java