Aggregation

• First aggregation query:

  curl -XPOST 'http://localhost:9200/orders/orders/_search?pretty=true' \
  -H 'content-type: application/json' \
  -d '
  {
  "size": 0, 
  "aggregations": {
    "order-status": {
      "terms": {
        "field": "status.keyword"
      }
    }
  }
  }'

• "size": 0 - suppress query results to fetch aggregations results only

• "aggregations" or "aggs" - part of ElasticSearch Dsl

• "order-status" - an arbitrary name for aggregation

• "terms" - type of aggregation to use

• "status.keyword" - multi-field mapping for text fields