[ingest pipeline] set convert in string

[gabriel_tessier]

Hi,

Using Elasticsearch 6.5.1

I tried to set a value using set and my new value become a string:

Here my debug simulate:

POST _ingest/pipeline/_simulate
{
  "pipeline" : {
    "description": "debug",
  "processors": [
    {
      "set": {
        "field": "end_int",
        "value": "(int){{end}}"
      }
    },
    {
      "set": {
        "if": "ctx.end > 2400;",
        "field": "result",
        "value": "Big"
      }
    },
    {
      "set": {
        "if": "ctx.end_int < 2400;",
        "field": "result",
        "value": "Small"
      }
    },
    {
      "remove": {
        "field": "end_int"
      }
    }
  ]},
  "docs": [
    {
      "_index": "banana",
      "_type": "_doc",
      "_id": "125468",
      "_score": 1,
      "_source": {
        "end": 2000
      }
    }
  ]
}

And it crash on the second condition the first condition is ok as end is integer but the one I set became a string...

"script_stack" : [
          "ctx.end_int < 2400;",
          "   ^---- HERE"
        ],
        "script" : "ctx.end_int < 2400;",
        "lang" : "painless",
        "caused_by" : {
          "type" : "class_cast_exception",
          "reason" : "Cannot apply [<] operation to types [java.lang.String] and [java.lang.Integer]."
        }

How can I keep the integer type when I use set?
As you can see in the simulate I add (int) but it not affect.

Only way to make it work is using convert

  "processors": [
{
  "set": {
    "field": "end_int",
    "value": "{{end}}"
  }
},
{
  "convert" : {
    "field" : "end_int",
    "type": "integer"
  }
},
....

If I set an integer I expect that my value stay integer. Did I mistake in the set definition?

Merry christmas.

Thanks.

[jakelandis]

If you run the simulation with verbose (POST _ingest/pipeline/_simulate?verbose) you can see you end up with "end_int" : "(int)2000" as the result of the set processor. That is still a String type.

Convert is the correct way to do this. You can simplify a bit like this:

      "convert": {
        "field": "end",
        "type": "integer",
        "target_field": "end_int"
      }
    }

[gabriel_tessier]

Got it thanks for the help.

But just to confirm, the "set" always cast in string? maybe adding a line in the documentation about can be helpful.
The field end is a integer, if I want to copy it I need to use "convert" to keep the type not "set" that will cast it in string.