fix a TestEarlyTerminatingSortingCollector.testTerminatedEarly test failure (avoid 1-document/1-unsorted-segment index by adding a 2nd segment/document before calling forceMerge(1) in createRandomIndex)
lucene/dev/trunk/lucene/misc/src/test/org/apache/lucene/search/TestEarlyTerminatingSortingCollector.java