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 jump start into Painless, see A Brief Painless Walkthrough. For a detailed description of the Painless syntax and language features, see the Painless Language Specification.
You can use Painless anywhere scripts are 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 allowlist 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 a subset of Java’s syntax to provide additional scripting language features.
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Optimizations: Designed specifically for Elasticsearch scripting.