aggregate per-region index statistics for pelias.

aggregations.sh

#!/bin/bash

curl -s -X POST "localhost:9200/pelias/_search?pretty=true&search_type=count" -d '
{
   "size": 0,
   "aggs": {
      "group_by_a3": {
         "terms": {
            "field": "alpha3"
         },
         "aggs": {
            "group_by_adm0": {
               "terms": {
                  "field": "admin0"
               },
               "aggs": {
                  "group_by_adm1": {
                     "terms": {
                        "field": "admin1"
                     },
                     "aggs": {
                        "group_by_adm2": {
                           "terms": {
                              "field": "admin2"
                           }
                        }
                     }
                  }
               }
            }
         }
      }
   }
}';