Using _user security variable inside ingest pipeline

Question

Hello,

I have setup a domain that uses IAM auth via cognito. I created the below ingest pipeline. However, the user property is always an empty string. Does aws open search support the _user security variable.

```
PUT _ingest/pipeline/post
{
  "description": "post",
  "processors": [
    {
      "set": {
        "description": "Add user info",
        "field": "user",
        "value": "{{_user.username}}"
      }
    }
  ]
}
```

Answer

Hello, as far as I know OpenSearch does not support **_user** variable.
Find another way to pass the user information via ingestion, for example...

```
POST /your_index/_doc
{
  "user": "user123",
  "other_field": "other_value"
}
```

Using _user security variable inside ingest pipeline

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