abac with covery query proposal

PUT my_index
{
    "mappings": {
        "properties": {
            "securityTags": { 
                "type": "keyword",
                "fields": {
                    "length": { 
                        "type":     "token_count",
                        "analyzer": "standard"
                    }
                }
            }
      }
    }
}


POST /my_index/1
{
    "sensitiveData": "Dave Erickson lives in Wahshington DC"
    "securityTags": ["DaveLocation", "DaveFullName"]
}


POST /_xpack/security/role/dave_security_role
{
    cluster: [],
    "indices": [
        {
            "names": ["my_index"],
            "privileges": ["read"],
            "query": {
                "terms_set": {
                    "securityTags": {
                        terms: ["DaveFullName", "DaveLocation", "DaveCatNames"],
                        minimum_should_match_field: "securityTags.length"
                    }
                }
            }
        }
    ]
}

@derickson The problem with the token_count is that it's counting tokens, not counting the length of the securityTags list. See this full example