https://lucene.apache.org/core/8_10_0/core/org/apache/lucene/index/MergeState.DocMap.html
MergeState.DocMap (Lucene 8.10.0 API)
docmapluceneapi
https://lucene.apache.org/core/4_10_3/core/org/apache/lucene/index/MergePolicy.DocMap.html
MergePolicy.DocMap (Lucene 4.10.3 API)
docmapluceneapi