A candidate is a set of possible values for a field.
When a search phrase consists of a single search word, the engine identifies any word in a document that contains the search word as a candidate. The candidates for the selected search phrase display highlighted on the document.
For each search word, an allowable number of errors (up to 8, depending upon the length of the search word) may be defined. An error may be a missing character, an inserted character, or a substituted character. The number of errors for a candidate is indicated in the tooltip for that highlighted candidate on the document.
It can be sometimes confusing how errors are applied. For example, if the search word is "qntity" and one error is allowed, the word "quantity" will be picked up as a candidate, because "qntity" matches substring "antity" with one error.
When searching for a search expression, the same method is applied to each search word ensuring that the "Maximum distance to next word" between search words is not exceeded.
If you set the significance of a search phrase to 'forbidden' and BIC finds at least one reliable candidate, candidates do not display highlighted.