Syntax for Pipeline Processor Condition in Kibana

[wpm (W.P. McNeill)]

I would like to write a pipeline that drops the field "A" from a document when its value is the string "None". I want to do this in the Kibana UI.

I figure I need a Remove processor when runs on the condition that A == "None". I'm at this point in the UI.

What should I type in the "Condition" box? I've tried various combinations of A == "None" with different quotation mark arrangements and either they don't parse or have no effect.

[stephenb (Stephen Brown)]

So you should probably read about conditionals

Basically you put in what is between the double quotes so for

   {
      "set": {
        "field": "test",
        "value": "25",
        "if": "ctx.other_field == 'test'"
      }
    }

so try

ctx.other_field == 'test'

The ctx is the ingest processor context

From the example

"if": "ctx?.network?.name == 'Guest'"

you would enter

ctx?.network?.name == 'Guest'