painless

Painless is an English adjective describing the absence of pain. It is used to characterize sensations, medical procedures, or experiences that cause little or no discomfort. The term can also imply ease or simplicity when describing processes or tasks that are without labor or hardship.

In medical contexts, painless is commonly used to describe procedures achieved through anesthesia or other analgesic methods, such as painless injections or surgeries. In everyday usage, it can describe activities that are agreeable or free of difficulty, as in "a painless installation" or "a painless recovery."

In computing, Painless is the name of a scripting language used in Elasticsearch. It was developed by Elastic to provide a fast, safe, and easy-to-write alternative to earlier scripting options such as Groovy. Painless features Java-like syntax with support for typed and dynamic variables, control flow, and common data structures (lists and maps). It runs inside a sandboxed execution environment in the Elasticsearch runtime and is designed to be compiled to efficient code, with safeguards to prevent expensive operations. Painless is the recommended scripting language for most in-cluster scripting tasks, including scripted fields, scripts in updates, and certain aggregations.