elasticsearch/docs/reference/scripting-languages/painless/painless-keywords.md

mapped_pages	products
https://www.elastic.co/guide/en/elasticsearch/painless/current/painless-keywords.html	id painless

Keywords [painless-keywords]

Keywords are reserved tokens for built-in language features.

Errors

• If a keyword is used as an identifier.

Keywords

if	else	while	do	for
in	continue	break	return	new
try	catch	throw	this	instanceof