Opensearch ignoring query

OpenSearch
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
Opensearch V2.6

Describe the issue:
when I run this query through the Explain API, the explanation that comes back seems to ignore the query string totally.

{
    "query": {
        "bool": {
            "must": [
                {
                    "match_phrase": {
                        "<param1>": "value"
                    }
                },
                {
                    "bool": {
                        "must_not": [
                            {
                                "query_string": {
                                    "query": "<param2>: value2 AND <param3>: >=now-2w"
                                }
                            }
                        ]
                    }
                }
            ]
        }
    }
}```
2

Can you show the response of the explain API?