FSDirectory.openFile(String) causes ClassCastException
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         Key: LUCENE-523
         URL: http://issues.apache.org/jira/browse/LUCENE-523
     Project: Lucene - Java
        Type: Bug
  Components: Store  
    Versions: 1.9, 2.0    
 Environment: Lucene 1.9.1
    Reporter: Eric Isakson


When you call FSDirectory.openFile(String) you get a ClassCastException since 
FSIndexInput is not an org.apache.lucene.store.InputStream

The workaround is to reimplement using openInput(String). I personally don't 
need this to be fixed but wanted to document it here in case anyone else runs 
into this for any reason.

The reason I'm calling this is that I have a requirement on my project to 
create read only indexes and name the index segments consistently from one 
build to the next. So, after creating and optimizing the index, I rename the 
files and rewrite the segments file. It would be nice if I had an API that 
would allow me to say "I only want one segment and I want its name to be 
'foo'". For instance IndexWriter.optimize(String segmentName)

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