how to determine whether a variable is array in Painless, Elasticsearch

Asked Feb 02 '18 at 08:04

Active Feb 02 '18 at 08:04

Viewed 4,919 times

I want to remove an element in array, if the field is not array, do nothing.

if (ctx._source?.field != null) {
  ctx._source.field.remove(ctx._source.field.indexOf('value'))
}

In order to do so, it has to determine whether the field is an array, or exception is expected. How?

In addition, is there detailed instruction of Painless? There is only get-started in elasticsearch website.

asked Feb 02 '18 at 08:04

Allen_Tsang

3

This answer may help: https://stackoverflow.com/a/48171394/4604579 (hint: use `instanceof`) – Val Feb 02 '18 at 08:08
@Val you must be an expert of Painless – Allen_Tsang Feb 02 '18 at 08:25
Did it work out? – Val Feb 02 '18 at 08:36
@Val absolutely – Allen_Tsang Feb 02 '18 at 09:19
1

Maybe put that as an answer? – Patrick Bassut Jan 11 '21 at 03:40

0 Answers0