Make MultiReader.isOptimized() return a useful result
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                 Key: LUCENE-1920
                 URL: https://issues.apache.org/jira/browse/LUCENE-1920
             Project: Lucene - Java
          Issue Type: Improvement
          Components: Index
            Reporter: Bernd Fondermann
            Priority: Minor


The MultiReader statically returns FALSE on any isOptimized() call.
This makes it unusable as the source index for an InstantiatedIndex, which 
checks initially if the source index is optimized and aborts if not.
The attached patch iterates all sub readers and returns TRUE if all of them are 
optimized.

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