Apache Lucene.Net 2.4.0 Class Library API

IndexReader.IsOptimized Method 

Checks is the index is optimized (if it has a single segment and no deletions). Not implemented in the IndexReader base class.

public virtual bool IsOptimized();

Return Value

true
if the index is optimized;
false
otherwise

See Also

IndexReader Class | Lucene.Net.Index Namespace