[Pick 2.0](index writer) fix dead lock when closeInternal catches CLuceneError (#207) #212
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From #207
This pull request addresses an issue within the closeInternal method. When Thread A invokes closeInternal and encounters a CLucene error, the method exits without setting the closing flag back to false. As a result, if another Thread B subsequently calls closeInternal and enters the waitForClose method, it becomes trapped in an infinite loop.