Does Elastic internally perform 'query' and 'suggest' requests in parallel?

Elastic Stack Elasticsearch
1

Elastics search provides feature to get search results and suggestions in a single request, reducing network overhead.

POST my-index-000001/_search
{
  "query" : {
    "match": {
      "message": "tring out Elasticsearch"
    }
  },
  "suggest" : {
    "my-suggestion" : {
      "text" : "tring out Elasticsearch",
      "term" : {
        "field" : "message"
      }
    }
  }
}

I believe internally these two clause are executed parallelly as there is no dependency between them. However, I couldn't find this information documented anywhere, reaching out here for confirmation.

Thanks
Raj