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Elasticsearch Server Second Edition by Marek Rogoziński, Rafał Kuć

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Scripting capabilities of Elasticsearch

Elasticsearch has a few functionalities where scripts can be used. You've already seen examples such as updating documents, filtering, and searching. Regardless of the fact that this seems to be advanced, we will take a look at the possibilities offered by Elasticsearch, because scripts are priceless for some use cases.

If we look at any request made to Elasticsearch that uses scripts, we will notice some similar properties, which are as follows:

  • Script: This property contains the actual script code.
  • Lang: This property defines the field that provides information about the script language. If it is omitted, Elasticsearch assumes mvel.
  • Params: This object contains parameters and their values. Every defined parameter ...

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