https://lucene.apache.org/core/5_5_0/core/org/apache/lucene/index/NoMergePolicy.html
NoMergePolicy (Lucene 5.5.0 API)
luceneapi
https://lucene.apache.org/core/5_4_0/core/org/apache/lucene/index/NoMergePolicy.html
NoMergePolicy (Lucene 5.4.0 API)
luceneapi