elasticsearch group-by multiple fields

Question

I am Looking for the best way to group data in elasticsearch. Elasticsearch doesn\'t support something like \'group by\' in sql.

Lets say I have 1k categories and mi

Answer 1

You can use Composite Aggregation query as follows. This type of query also paginates the results if the number of buckets exceeds from the normal value of ES. By using the field 'after' you can access the rest of buckets:

"aggs": {
    "my_buckets": {
      "composite": {
        "sources": [
          {
            "field1": {
              "terms": {
                "field": "field1"
              }
            }
          },
          {
            "field2": {
              "terms": {
                "field": "field2"
              }
            }
          },
         {
            "field3": {
              "terms": {
                "field": "field3"
              }
            }
          },
        ]
      }
    }
  }

You can find more detail in ES page bucket-composite-aggregation.