Investigate modifying the Sphinx search engine
The current Sphinx search engine doesn't allow for the use of special characters (such as periods or hyphens). A search for "cdap-site.xml" doesn't return any entries because of this.
Another related-issue is to look at turning on the Sphinx "perma-links" that can appear at the end of titles to provide a quick permanent link that can be pasted in an message to share links with other people.
It seems to be a good idea if we can add checkbox to choose search across releases.
By default current release only, when check - all releases.