https://lucene.apache.org/core/5_4_0/core/org/apache/lucene/util/fst/IntsRefFSTEnum.InputOutput.html
IntsRefFSTEnum.InputOutput (Lucene 5.4.0 API)
luceneapi
https://lucene.apache.org/core/6_2_1/core/org/apache/lucene/util/fst/class-use/IntsRefFSTEnum.InputOutput.html
Uses of Class org.apache.lucene.util.fst.IntsRefFSTEnum.InputOutput (Lucene 6.2.1 API)