Directory
Directory: Location of a Lucene Index.
The Directory class represents the location of a Lucene index. It’s an abstract class that allows its subclasses to store the index as they see fit. In our Indexer example, we used FSDirectory.open to get a suitable concrete FSDirectory implementation that stores real files in a directory on the file system, and passed that in turn to Index- Writer’s constructor. Lucene includes a number of interesting Directory implementations, covered in section 2.10. IndexWriter can’t index text unless it’s first been broken into separate words, using an analyzer.
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