Mongo DB

Adds the sort operator, which supports sorting in ascending or descending order on fields that you define in your Atlas Search index for sorting.

Limits the knnBeta operator as a top-level operator.

Introduces the ability to perform text, wildcard, regular expression, fuzzy, and range searches on string fields by using the queryString operator.

I get this is a long shot but hey, lets make some content.

I am trying to search (via mongodb commands) inside fields that contain the following example JSON content:

Each 'Details' field uses the same structure inside the collection:

[
    {
        "references": [
            "https://www.owasp.org/index.php/SQL_Injection",
            "https://cwe.mitre.org/data/definitions/89.html"
        ],
        "locale": "en",
        "title": "SQL injection is possible",
        "vulnType": "Web Application",
        "description": "<p>SQL injection (or SQLi)....</p>",
        "observation": "<p>The following endpoint and subsequent data extraction was found to be vulnerable to SQL injection:</p><p></p>",
        "remediation": "<p>The most effective way to prevent SQL....</p></li></ul>",
        "customFields": [
            {
                "customField": "631816bfcef08a001188c9d5",
                "text": "A03:2021-Injection"
            },
            {
                "customField": "631855d0cef08a001188ca0c",
                "text": ""
            },
            {
                "customField": "63198741cef08a001188ca38",
                "text": ""
            },
            {
                "customField": "638d3ff17406ad001120d10d",
                "text": "C3: Secure Database Access"
            },
            {
                "customField": "639680ce7406ad001120d196",
                "text": "Implementation"
            }
        ]
    }
]

I have tried assorted commands such as:

db.vulnerabilities.find({Details: {$regex: 'Web Application'}}
db.vulnerabilities.find({ Details: { $in: ["vulnType"]}})
db.vulnerabilities.find({ "details" : /vulnType/ }

These are shots in the dark clearly but I cant see an obvious way to look for specific strings or even json pairs. Any help would be appreciated.