IndexReader.reopen() does not retain TermInfosIndexDivisor setting for newly 
opened segments
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                 Key: LUCENE-1735
                 URL: https://issues.apache.org/jira/browse/LUCENE-1735
             Project: Lucene - Java
          Issue Type: Bug
          Components: Index
    Affects Versions: 2.4.1
            Reporter: Tim Smith


If you reopen() and IndexReader with a custom setting for 
TermInfosIndexDivisor, the new segments will not get the old setting for 
TermInfosIndexDivisor set on the IndexReader opened with IndexReader.open()

Furthermore, if you call setTermInfosIndexDivisor() on the reopend index, you 
will likely encounter a IllegalStateException (if any segments were retained 
from previous index) because the old segments will have already been loaded 
(and will now throw an exception when trying to set the value)

Suggest that either the value be propagated to newly opened segments on reopen, 
or DirectoryReader ignore IllegalStateException from segment readers on 
setTermInfosIndexDivisor()


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