Alerting: 'IS NOT' operator needed

Plugins Alerting
1

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

v2.2.0

Describe the issue:

Hi guys,

I want to configure a monitor, where certain values from multiple queries should be a trigger for an alert.
Now, I want to exclude one value in one query (operator “is not”?).

Example: Trigger the alert, when value x in query 1 and query 2 is logged but not when the value “y” is logged in query 3.

The following query code shows my current monitor with the classic “and” operators.
How can I add an “is not” condition?

Relevant Logs or Screenshots:

{
    "size": 0,
    "query": {
        "bool": {
            "filter": [
                {
                    "range": {
                        "@timestamp": {
                            "from": "{{period_end}}||-10m",
                            "to": "{{period_end}}",
                            "include_lower": true,
                            "include_upper": true,
                            "format": "epoch_millis",
                            "boost": 1
                        }
                    }
                },
                {
                    "match_phrase": {
                        "winlog.event_data.TargetUserName": {
                            "query": "USERNAME",
                            "slop": 0,
                            "zero_terms_query": "NONE",
                            "boost": 1
                        }
                    }
                },
                {
                    "match_phrase": {
                        "agent.hostname": {
                            "query": "HOSTNAME",
                            "slop": 0,
                            "zero_terms_query": "NONE",
                            "boost": 1
                        }
                    }
                },
                {
                    "match_phrase": {
                        "event.code": {
                            "query": "1234",
                            "slop": 0,
                            "zero_terms_query": "NONE",
                            "boost": 1
                        }
                    }
                }
            ],
            "adjust_pure_negative": true,
            "boost": 1
        }
    },
    "aggregations": {}
}