Computes a score factor for a simple term and returns an explanation for that score factor.

The default implementation uses:

            idf(searcher.docFreq(term), searcher.maxDoc());
            

Note that {@link Searcher#MaxDoc()} is used instead of {@link Lucene.Net.Index.IndexReader#NumDocs()} because it is proportional to {@link Searcher#DocFreq(Term)} , i.e., when one is inaccurate, so is the other, and in the same direction.

public virtual Explanation..::..IDFExplanation IdfExplain(
	Term term,
	Searcher searcher
)

Public Overridable Function IdfExplain ( _
	term As Term, _
	searcher As Searcher _
) As Explanation..::..IDFExplanation

public:
virtual Explanation..::..IDFExplanation^ IdfExplain(
	Term^ term, 
	Searcher^ searcher
)