Create new fields in elasticsearch

i want to calculate the difference in time between 2 logs different and add the value to a new field
i search in google and i find that is possible with painless scripting but i dont know how to do it
if there is anyone who already use painless scripting to add new fields can help me
btw i inject logs with filebeat to elastic saerch

thank you so much

On its own, using painless to add a field is pretty straightforward. This would be easier to accomplish if the time differences were stored on the same document. Here's an example _update_by_query painless script of that scenario:

POST log_duration_testing/_update_by_query
  "query": {
    "match_all": {}
  "script": {
    "lang": "painless",
    "source": """
      ZonedDateTime zdt_start = ZonedDateTime.parse(ctx._source['event_start_datetime']);
      ZonedDateTime zdt_stop = ZonedDateTime.parse(ctx._source.event_stop_datetime);
      long event_start_datetime_millis = zdt_start.toInstant().toEpochMilli();
      long event_stop_datetime_millis = zdt_stop.toInstant().toEpochMilli();
      long durationMillis = event_stop_datetime_millis - event_start_datetime_millis;
      ctx._source.duration_sec = durationMillis / 1000;

When run, this would update all documents in the log_duration_testing index and add a field called duration_sec based on the difference between the fields event_stop_datetime and event_start_datetime.

However, if you're looking to compare the differences in time between separate documents, that becomes a different tactic.

One way to accomplish this would be to do something similar to what is discussed here with transforms.

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