miscellaneous is a home of different Lucene-related classes
that all belong to org.apache.lucene.misc package, as they are not
substantial enough to warrant their own package.
miscellaneous：杂项
substantial：大量的
warrant：保证
另一些和Lucene不相关的类，被归类到了misc包中（他们代码不是很多，没达到单独放到一个包的量级）
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