How to return all documents for each bucket?

Elastic Stack Elasticsearch
1

bucket aggregation return the count of documents for each bucket. I want to retrieve the documents within each bucket that matched that bucket criteria, then tried to add the following top_hits sub aggregation:

{
    "aggregations": {
        "myaggregation": {
            "terms": {
                       "field": "title",
                      "size": 0,
                      "shard_size" :0
             },
            "aggregations": {
                "hits": {
                    "top_hits": { "size": 100000 }
                }
            }
        }
    }
}

but This top_hits works very slow.
Is there any proper way to fetch the actual documents for each bucket after doing the terms aggregation quickly?