import io.anserini.document.SourceDocument;
import io.anserini.index.generator.LuceneDocumentGenerator;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.lucene.analysis.en.EnglishAnalyzer;
<BUG>import org.apache.lucene.analysis.util.CharArraySet;
import org.apache.lucene.document.Document;</BUG>
import org.apache.lucene.index.ConcurrentMergeScheduler;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;

import io.anserini.document.SourceDocument;
import io.anserini.index.generator.LuceneDocumentGenerator;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.lucene.analysis.en.EnglishAnalyzer;
import org.apache.lucene.analysis.CharArraySet;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.ConcurrentMergeScheduler;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
