Executing statistical facets

The core of real-time analytics is the statistical facet. It works on numerical fields and in one-shot is able to compute several numerical metrics.

Getting ready

You need a working ElasticSearch cluster and an index populated with the script available in online code.

How to do it...

For executing statistical facets, we will perform the steps given as follows:

1. We need to compute two different statistical facets, that are:

   • price statistic

   • age statistic

2. The query to execute these facets is:

   curl -XGET 'http://127.0.0.1:9200/test-index/test-type/_search?pretty=true&size=0' -d '{
       "query": {
           "match_all": {}
       },
       "facets": {
           "age" : {
               "statistical" : {
                   "field" : "age",
               }
           },
           "price" : {
               "statistical" : {
                   "field" : "price",
               }
           }
       }
   }'

3. The result will be:

   {
     "took" : 12,
     "timed_out" : false,
     "_shards" : {
       "total" : 5,
       "successful" ...