Script query fails when trying to iterate over nested field

OpenSearch
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):
1.2.4

Describe the issue:
Hello!
I got a question on how can I iterate over elements of nested object in a query.
I have index of the following structure:

{
   "elements":{
      "type":"nested",
      "properties":{
         "action_code":{
            "type":"keyword"
         },
         "created_at":{
            "type":"date"
         }
      }
   }
}

I’d like to filter documents so that documents for which most recent item in elements array has action_code= my_action are filtered out.
I tried to use the following query:

{
    "query": {
        "bool": {
            "filter": {
                "script": {
                    "script": "String latestAction = ''; Date latestActionDate = new Date(Long.MIN_VALUE); for(nextAction in doc['elements'].values){if(nextAction['created_at'].value > latestActionDate){latestAction = nextAction['action_code'].value; latestActionDate = nextAction['created_at'].value }}return latestAction != 'my_action'"
                }
            }
        }
    }
}

However, I keep getting "No field found for [elements] in mapping with types []"

For update scripts I can access nested field and iterate over it with ctx._source.elements. However, for script inside the query it seems there is no context available, since replacing doc['elements'] with ctx._source.elements throws an error that ctx is unknown field.

Is there any way to iterate over nested field in the query in Opensearch? How can I make query script be aware of context?

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