"Fossies" - the Fresh Open Source Software Archive 
Painless is a simple, secure scripting language designed specifically for use with Elasticsearch. It is the default scripting language for Elasticsearch and can safely be used for inline and stored scripts. For a detailed description of the Painless syntax and language features, see the {painless}/painless-lang-spec.html[Painless Language Specification].
You can use Painless anywhere scripts can be used in Elasticsearch. Painless provides:
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Fast performance: Painless scripts run several times faster than the alternatives.
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Safety: Fine-grained whitelist with method call/field granularity. See the {painless}/painless-api-reference.html[Painless API Reference] for a complete list of available classes and methods.
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Optional typing: Variables and parameters can use explicit types or the dynamic
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Syntax: Extends Java’s syntax to provide Groovy-style scripting language features that make scripts easier to write.
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Optimizations: Designed specifically for Elasticsearch scripting.