Convert Number (elapsed_time) into Time (HH:MM:SS)

[angelo]

In terms of Kibana and the error that you have in your screenshot, it's pointing out that you have some documents that have a missing value for elapsed_time and that you should do a check first. So with that and assuming that you want to allow hours to be larger than 24 (or else in a date/time format, that would increment the day field), here is an example:

if (doc['elapsed_time'].size()==0) {
    return ""
} else {
    long elapsed_time=(long)doc["elapsed_time"].value*1000;

    long secondsInMilli = 1000;
    long minutesInMilli = secondsInMilli * 60;
    long hoursInMilli = minutesInMilli * 60;
    long daysInMilli = hoursInMilli * 24;

    // long elapsedDays = elapsed_time / daysInMilli;
    // elapsed_time = elapsed_time % daysInMilli;/
	
    long elapsedHours = elapsed_time / hoursInMilli;
    elapsed_time = elapsed_time % hoursInMilli;

    long elapsedMinutes = elapsed_time / minutesInMilli;
    elapsed_time = elapsed_time % minutesInMilli;

    long elapsedSeconds = elapsed_time / secondsInMilli;

    String my_answer = String.format('%02d:%02d:%02d', new def[] {(int)elapsedHours, (int)elapsedMinutes, (int)elapsedSeconds});
    return my_answer;
}

I left elapsedDays as a comment just in case you did want to use it.