The scripting module enables you to use scripts to evaluate custom expressions. For example, you could use a script to return "script fields" as part of a search request or evaluate a custom score for a query.
The default scripting language is Painless.
Additional lang plugins enable you to run scripts written in other languages.
Everywhere a script can be used, you can include a lang parameter
to specify the language of the script.
General-purpose languages:
These languages can be used for any purpose in the scripting APIs, and give the most flexibility.
| Language | Sandboxed | Required plugin |
|---|---|---|
yes | built-in |
Special-purpose languages:
These languages are less flexible, but typically have higher performance for certain tasks.
| Language | Sandboxed | Required plugin | Purpose |
|---|---|---|---|
yes | built-in | fast custom ranking and sorting | |
yes | built-in | templates | |
n/a | you write it! | expert API |
Scripts and security
Languages that are sandboxed are designed with security in mind. However, non- sandboxed languages can be a security issue, please read Scripting and security for more details.