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Lucene - The First Parameter of the Index Writer

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I am constructing a web site. I am learning the Lucene so that I can use it to search the database. I started with reading the "Introdution In Text Indexing with Jakarta Apache Lucene" at
and in the example given, it looks that I have to specify a directory for the first parameter of the IndexWriter (see below).

I have a record created and stored in a table in my database whenever a user submits his/her inputs. And I want to index that record. What should be the indexDir in my case? Should I follow the above example and use ""? I sort of doubt it. Please advise.
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