/usr/include/CLucene/index/ is in libclucene-dev 2.3.3.4-4build1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/CLucene/index/DirectoryIndexReader.h
/usr/include/CLucene/index/IndexDeletionPolicy.h
/usr/include/CLucene/index/IndexModifier.h
/usr/include/CLucene/index/IndexReader.h
/usr/include/CLucene/index/IndexWriter.h
/usr/include/CLucene/index/MergePolicy.h
/usr/include/CLucene/index/MergeScheduler.h
/usr/include/CLucene/index/MultiReader.h
/usr/include/CLucene/index/MultipleTermPositions.h
/usr/include/CLucene/index/Payload.h
/usr/include/CLucene/index/Term.h
/usr/include/CLucene/index/TermVector.h
/usr/include/CLucene/index/Terms.h