# How to use carriage return in a script template with a runtime mapping field?

**URL:** <https://discuss.elastic.co/t/how-to-use-carriage-return-in-a-script-template-with-a-runtime-mapping-field/293879>\
**Category:** Elasticsearch\
**Tags:** painless, runtime-fields\
**Created:** [January 10, 2022, 11:17am UTC](https://discuss.elastic.co/t/how-to-use-carriage-return-in-a-script-template-with-a-runtime-mapping-field/293879 "2022-01-10T11:17:32Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Ricou13](https://avatars.discourse-cdn.com/v4/letter/r/82dd89/32.png) [@Ricou13](https://discuss.elastic.co/u/Ricou13)\
**Post date:** [January 10, 2022, 11:17am UTC](https://discuss.elastic.co/t/how-to-use-carriage-return-in-a-script-template-with-a-runtime-mapping-field/293879/1 "2022-01-10T11:17:32Z")

</div>

Here is an example that illustrates the problem we are having with "mustache" and the carriage return.

In our script template, we need :

- a runtime mapping field : to compute a result (with a big script in our real case)
- conditional template : to build search criteria according to params existence (many criteria in our real case)

We use Elasticsearch 7.16 and kibana debug console to make our tests.

## We create this script template with this request :

```auto
POST _scripts/test
{
  "script": {
    "lang": "mustache",
    "source": """{
      "runtime_mappings": {
        "result": {
          "type": "long",
          "script": {
            "source": "emit({{#foo}}{{foo}}{{/foo}}{{^foo}}0{{/foo}})"
          }
        }
      }
      {{#foo}}
        ,"fields": [
          "result"
        ]
      {{/foo}}
    }"""
  }
}

```

## Here are 2 examples of requests that show how this script works:

**Request 1 : Search request with param**  
Return the computed field "result" with the "foo" parameter value (12345)

```auto
GET _search/template
{
  "id": "test",
  "params": {
    "foo": 12345
  }
}

```

**Request 2 : Search request without param**  
Don't return computed field "result".

```auto
GET _search/template
{
  "id": "test"
}

```

Like i said before, in our real case we have a very big "painless" script in the computed field.  
For more readability, we therefore wrote this script on several lines and that's when a problem appears.

## An error happened when we declare:

```auto
"source": "
  emit({{#foo}}{{foo}}{{/foo}}{{^foo}}0{{/foo}})
"

```

instead of:

```auto
"source": "emit({{#foo}}{{foo}}{{/foo}}{{^foo}}0{{/foo}})"

```

Due to the JSON specifications, we cannot use carriage returns otherwise we get the following error:  
`Illegal unquoted character ((CTRL-CHAR, code 10)): has to be escaped using backslash to be included in string value`

We also cannot use the notation with """ because it will conflict with the one used to declare the source of the script template.

Is there a trick to set the computed field script to multiple lines in Kibana debug console ?

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 7, 2022, 11:17am UTC](https://discuss.elastic.co/t/how-to-use-carriage-return-in-a-script-template-with-a-runtime-mapping-field/293879/2 "2022-02-07T11:17:51Z")

</div>

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