Executing histogram facets

ElasticSearch numerical values can be used to process histogram data. The histogram representation of a facet is a very powerful way to show data to end-users.

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 histogram facets, we will perform the steps given as follows:

1. Using the items populated with the script, we want to calculate facets on:

   • Age with interval of 5 years

   • Price with interval of $10

   • Date with interval of 6 months

2. The query will be:

   curl -XGET 'http://127.0.0.1:9200/test-index/test-type/_search?pretty=true&size=0' -d '{
       "query": {
           "match_all": {}
       },
       "facets": {
           "age" : {
               "histogram" : {
                   "field" : "age",
                   "interval" : 5
               }
           },
           "price" : {
               "histogram" : {
                   "field" : "price",
                   "interval" : 10.0
               }
           }...