Redirects should return code 301. Ondrej Zizka wrote this tip:

Current JBoss Wiki redirects using HTML element <meta>, and returns HTTP code 200.
Note that this has negative impact on how Google ranks these pages. We should redirect using HTTP 301.

For example:
wiki.jboss.org/wiki/Wiki.jsp?page=FAQ
wiki.jboss.org/wiki/Wiki.jsp?page=HelpBugReport