Take a look at pipeline aggs https://www.elastic.co/guide/en/elasticsearch/reference/2.2/search-aggregations-pipeline.html
If that doesn't do it then you need to do it in code.
Take a look at pipeline aggs https://www.elastic.co/guide/en/elasticsearch/reference/2.2/search-aggregations-pipeline.html
If that doesn't do it then you need to do it in code.
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