To return multi-phrase synonyms when searching with query type phrase and auto generate synonyms phrase query set to true

OpenSearch
1

I have set up the synonym_graph as [“error” => “system failure”]
And have been using the following query:

{
  "query": {
    "bool": {
      "must": [
        {
          "multi_match": {
            "query": "unexpected error occurred",
            "fields": ["text"],
            "type": "phrase",
            "auto_generate_synonyms_phrase_query":true
          }
        }
      ]
    }
  }
}

This returns the results that have either “unexpected error occurred” or “unexpected system failure occurred”.
But I would also like to include results that have synonyms of these keywords such as “system failure” regardless of the other keywords present in the query.

I do not want to increase the result set by using the ‘operator: OR’ query here. Nor do I want to split all the keywords and send independent query for each.

How can this be achieved here?