getImpacts

Return impacts on the given level. These impacts are sorted by increasing frequency and increasing unsigned norm, and only valid until the doc ID returned by .getDocIdUpTo for the same level, included. The returned list is never empty and should implement java.util.RandomAccess if it contains more than a single element. NOTE: There is no guarantee that these impacts actually appear in postings, only that they trigger scores that are greater than or equal to the impacts that actually appear in postings.