* completely in the future, but it's likely to be a specialized
* version of the general Xapian query syntax:
*
- * http://xapian.org/docs/queryparser.html
+ * https://xapian.org/docs/queryparser.html
*
* As a special case, passing either a length-zero string, (that is ""),
* or a string consisting of a single asterisk (that is "*"), will