Injest Pipeline Script for nested list of array - retrieve and copy data data from old field to new field in Kibana

My goals -

1. Find the existing field if present (responseBody.results[i].statusCode) and copy it's value into a new field (embedded_error_code ) at runtime
2. My original field is a list of array. Below is the structure of my original field - (responseBody.results[i].statusCode)

 "responseBody": {
      "results": [
        {
          "hasErrors": false,
          "statusCode": 201,
          "uniqueId": "***",
          "messageId": null,
          "customerId": "***",
          "developerMessage": "SUCCESS",
          "userMessage": "SUCCESS",
          "errors": []
        }
      ]
    },

My working Script when used with _update_by_query

POST _scripts/test-embedded-script
{
  "script": {
    "lang" : "painless",
     "source": """
        if(ctx._source.responseBody != null )
        {
            for (int i = 0; i < ctx._source.responseBody.results.length; ++i) 
            {
              ctx._source.embedded_error_code = ctx._source.responseBody.results[i].statusCode;
            } 
        }"""
  }
}

My defined pipeline -

PUT _ingest/pipeline/apiproxy-embedded
{
  "processors": [
    {
      "script": {
        "id": "test-embedded-script"
      }
    }
  ]
}

I want to run the above script runtime, that's why I'm using Injest Pipeline test-embedded-script isn't working in apiproxy-embedded pipeline. Please help me to write this script as one of the processors of my pipeline.

NOTE : I'm not mapping/indexing my original field i.e. responseBody.results[i].statusCode and I don't want to map this field as well because it's of no use. I want to map new field only i.e. embedded_error_code.