ElasticSearch 1.0 aggregations

curl -XGET http://localhost:9200/store_development_products/_search -d '
{
  "aggs": {
    "category_ids": {
      "terms": { 
        "field": "root_category_ids", 
        "size": 1000 
      },
      "aggs" : {
        "by_product_type": {
          "terms": { 
            "field": "product_type", 
            "size": 4
          }
        }
      }
    }
  }
}'

# "aggregations" : {
#   "category_ids": { 
#     "buckets" : [
#       { 
#         "key" : 1446,
#         "doc_count" : 1018, 
#         "by_product_type" : {
#           "buckets" : [
#             {"key":"chapter","doc_count":903},
#             {"key":"remix","doc_count":80},
#             {"key":"book","doc_count":35}
#           ]
#         }
#       },
#       ...