scripting.md

mapped_pages	https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting.html
applies_to	stack serverless ga ga
products	id elasticsearch

Scripting [modules-scripting]

With scripting, you can evaluate custom expressions in {{es}}. For example, you can use a script to return a computed value as a field or evaluate a custom score for a query.

The default scripting language is Painless. Additional lang plugins are available to run scripts written in other languages. You can specify the language of the script anywhere that scripts run.

Available scripting languages [scripting-available-languages]

Painless is purpose-built for {{es}}, can be used for any purpose in the scripting APIs, and provides the most flexibility. The other languages are less flexible, but can be useful for specific purposes.

Language	Sandboxed	Required plugin	Purpose
painless		Built-in	Purpose-built for {{es}}
expression		Built-in	Fast custom ranking and sorting
mustache		Built-in	Templates
java		Not available	Expert API