Just highlighting a quirk with the solr ref guide that maybe should be fixed? The search box only finds results for the latest version of Solr, however if you are on any page and change the version to an older version via the upper-left dropdown it will redirect you back to the homepage. At best it means that searching for older documentation means you have to modify the url to get where you want after searching, at worst it means that you cannot search text from older pages.
Perhaps one (or both) of these solutions would be helpful: 1. Search box is version-aware 2. Changing version of the ref guide keeps you on the same page you're currently on (if it exists for that version) -Kevin