deprecate Scorer.explain
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Key: LUCENE-1780
URL: https://issues.apache.org/jira/browse/LUCENE-1780
Project: Lucene - Java
Issue Type: Improvement
Reporter: Michael McCandless
Assignee: Michael McCandless
Priority: Minor
Fix For: 2.9
Spinoff from LUCENE-1749.
We already have QueryWeight.explain, which is directly invoked by
IndexSearcher.explain. Some queries in turn will defer to their Scorer impl's
explain, but many do not (and their Scorer.explain simply throw UOE). So we
should deprecate & remove Scorer.explain, leaving it up to individual queries
to define that method if they need it.
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