Adds temporary redirect for Watcher troubleshooting

Author: lcawl

docs/en/stack/redirects.asciidoc

@@ -59,3 +59,7 @@ include::help.asciidoc[tag=get-help]
 * <<ml-limitations>>
 * <<dataframe-limitations>>
 
+[role="exclude",id="watcher-troubleshooting"]]
+=== Troubleshooting {watcher}
+
+See https://www.elastic.co/guide/en/elastic-stack-overview/7.2/watcher-troubleshooting.html