Aggregation on top N results

Question

Problem:

If I search for \"iphone\" I get 400 product results and the product category aggregation I have returns the top 3 categories in the result

Answer 1

You are looking for Sampler Aggregation. I have a similar answer at Aggregation on top n results

{
  "aggs": {
    "bestDocs": {
       "sampler": {
            "shard_size":100
         },
       "aggs": {
          "product_categories": {
             "terms": {
                "field": "product_category",
                "size": 3
             }
          }
       } 
   }
}

It will take the top 100 docs sorted by their scores and then do term aggregation.