https://lucene.apache.org/core/4_3_0/core/org/apache/lucene/index/class-use/SegmentReader.CoreClosedListener.html
Uses of Interface org.apache.lucene.index.SegmentReader.CoreClosedListener (Lucene 4.3.0 API)
https://lucene.apache.org/core/5_4_0/core/org/apache/lucene/index/SegmentReader.html
SegmentReader (Lucene 5.4.0 API)
luceneapi