https://lucene.apache.org/core/5_3_1/core/org/apache/lucene/util/SPIClassIterator.html
SPIClassIterator (Lucene 5.3.1 API)
luceneapi
https://lucene.apache.org/core/6_2_1/core/org/apache/lucene/util/class-use/SPIClassIterator.html
Uses of Class org.apache.lucene.util.SPIClassIterator (Lucene 6.2.1 API)
apache lucene