Elasticsearch provides scripting support for sorting functionality. In real-world applications, there is often a need to modify the default sort by match score using an algorithm that depends on the context and some external variables. Some common scenarios are as follows:
Because the compute of scores on a large dataset is very CPU intensive, if you use scripting it's better execute it on a small dataset using standard score queries for detecting the top documents, and then execute a rescoring on the top subset.
You need an up-and-running Elasticsearch installation as we described in the