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Elasticsearch Reference [5.x] » Aggregations » Returning only aggregation results
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Returning only aggregation resultsedit

There are many occasions when aggregations are required but search hits are not. For these cases the hits can be ignored by setting size=0. For example:

GET /twitter/tweet/_search
{
  "size": 0,
  "aggregations": {
    "my_agg": {
      "terms": {
        "field": "text"
      }
    }
  }
}

Setting size to 0 avoids executing the fetch phase of the search making the request more efficient.

«  Caching heavy aggregations     Aggregation Metadata  »