[DOCS] Add redirect for painless examples anchor

docs/painless/painless-guide/index.asciidoc

@@ -7,3 +7,5 @@ include::painless-method-dispatch.asciidoc[]
 include::painless-debugging.asciidoc[]
 
 include::painless-execute-script.asciidoc[]
+
+include::../redirects.asciidoc[]

docs/painless/redirects.asciidoc

@@ -0,0 +1,9 @@
+["appendix",role="exclude",id="redirects"]
+= Deleted pages
+
+The following pages have moved or been deleted.
+
+[role="exclude",id="painless-examples"]
+=== Painless examples
+
+See <<painless-walkthrough, Painless walkthrough>>.