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Send Lucene's IndexWriter infoStream messages to Logger lucene.iw, le…
…vel=TRACE Lucene's IndexWriter logs many low-level details to its infoStream which can be helpful for diagnosing; with this change, if you enable TRACE logging for the "lucene.iw" logger name then IndexWriter's infoStream output will be captured and can later be scrutinized e.g. using https://code.google.com/a/apache-extras.org/p/luceneutil/source/browse/src/python/iwLogToGraphs.py to generate graphs like http://people.apache.org/~mikemccand/lucenebench/iw.html Closes #5891
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