Bucket level monitor include document field like sample_documents for dedupedAlerts and completedAlerts

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
2.13.0

Describe the issue:

I have a bucket level monitor with the following query:

{
    "size": 1,
    "query": {
        "bool": {
            "filter": [
                {
                    "range": {
                        "@timestamp": {
                            "from": "{{period_end}}||-1h",
                            "to": "{{period_end}}",
                            "include_lower": true,
                            "include_upper": true,
                            "format": "epoch_millis",
                            "boost": 1
                        }
                    }
                },
                {
                    "match_phrase": {
                        "MESSAGE": {
                            "query": "*connection failed*",
                            "slop": 0,
                            "zero_terms_query": "NONE",
                            "boost": 1
                        }
                    }
                }
            ],
            "adjust_pure_negative": true,
            "boost": 1
        }
    },
    "aggregations": {
        "composite_agg": {
            "composite": {
                "size": 10,
                "sources": [
                    {
                        "hostname": {
                            "terms": {
                                "field": "hostname",
                                "missing_bucket": false,
                                "order": "asc"
                            }
                        }
                    }
                ]
            }
        }
    }
}

The index/documents this query is used on has also a field named “MESSAGE”. I want to include that field named “MESSAGE” into the notification message but not use group by on it in the query.

ctx.results.0.hits.hits does not work here because I want the “MESSAGE” field from one of the grouped by elements and not a random “MESSAGE” field value.

Does anybody have an idea how to do that?

btw.: the new sample_documents would work here but I want that not only for newAlerts but also for dedupedAlerts and completedAlerts and sample_documentsonly works for newAlerts.

any ideas?

any ideas would be highly appreciated