https://lucene.apache.org/core/5_0_0/core/org/apache/lucene/store/RAMOutputStream.html
RAMOutputStream (Lucene 5.0.0 API)
luceneapi
https://lucene.apache.org/core/5_3_1/core/org/apache/lucene/store/RAMOutputStream.html
RAMOutputStream (Lucene 5.3.1 API)
luceneapi