Rollup Job when one of the Terms field is array

I am trying to create a RollUp job from Kibana. In the Terms field where I have given multiple fields, in which one of the fields is of an array type (String type in Index). How RollUp job will aggregate data on the array field?

Sample data:

    "requestTimestamp": 1591863551950,
    "osId": "iOS",
    "CountryOp": 1,
    "countryId": "gbr",
    "@timestamp": "2020-06-11T08:19:11.950Z",
    "OsOp": 1,
"strategyIds": [

Group by on: strategyIds, countryId
Aggregrate on: CountryOp, OsOp

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