[DOCS] Mark painless execute api as experimental (#30710)

martijnvg · martijnvg · commit 3451f27df5dc · 2018-05-21T09:49:59.000+02:00
diff --git a/docs/painless/painless-execute-script.asciidoc b/docs/painless/painless-execute-script.asciidoc
@@ -1,6 +1,8 @@
 [[painless-execute-api]]
 === Painless execute API
 
+experimental[The painless execute api is new and the request / response format may change in a breaking way in the future]
+
 The Painless execute API allows an arbitrary script to be executed and a result to be returned.
 
 [[painless-execute-api-parameters]]
