errors is calculated by dividing the token length of a specified query term by 4,
preserving a minimum of 1 errors. A static error distance can be set by adjusting
the <code>LSERR[[Options#Full-text options|LSERROR]]</code> property (default: <code>SET LSERR LSERROR 0</code>).
The query above yields two results as there is no error between the query term
"foo" and the text node "foo bar", and one error between