Lucene in 5 minutes (https://lucenetutorial.com/lucene-in-5-minutes.html) with lucene 9.9.1

main.java

package org.example;

import java.io.IOException;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.store.ByteBuffersDirectory;

public class Main {

  private static final int hitsPerPage = 10;

  public static void main(String[] args) {
    ByteBuffersDirectory index = null;
    try {
      index = initializeIndex();
    } catch (IOException e) {
      e.printStackTrace();
      System.exit(1);
    }

    Query query = null;
    try {
      var queryString = args.length > 0 ? args[0] : "lucene";
      var queryAnalyzer = new StandardAnalyzer();
      query = new QueryParser("title", queryAnalyzer).parse(queryString);
    } catch (ParseException e) {
      e.printStackTrace();
      System.exit(1);
    }

    try (var reader = DirectoryReader.open(index)) {
      var searcher = new IndexSearcher(reader);
      var docs = searcher.search(query, hitsPerPage);
      var hits = docs.scoreDocs;

      System.out.println("Found " + hits.length + " hits.");
      var storeFields = searcher.storedFields();
      for (int i = 0; i < hits.length; ++i) {
        int docId = hits[i].doc;
        var d = storeFields.document(docId);
        System.out.println((i + 1) + ". " + d.get("isbn") + "\t" + d.get("title"));
      }
    } catch (IOException e) {
      e.printStackTrace();
      System.exit(1);
    }
  }

  private static ByteBuffersDirectory initializeIndex() throws IOException {
    var index = new ByteBuffersDirectory();
    var indexAnalyzer = new StandardAnalyzer();
    var config = new IndexWriterConfig(indexAnalyzer);
    try (var w = new IndexWriter(index, config)) {
      addDoc(w, "Lucene in Action", "193398817");
      addDoc(w, "Lucene for Dummies", "55320055Z");
      addDoc(w, "Managing Gigabytes", "55063554A");
      addDoc(w, "The Art of Computer Science", "9900333X");
    } catch (IOException e) {
      throw e;
    }

    return index;
  }

  private static void addDoc(IndexWriter w, String title, String isbn) throws IOException {
    var doc = new Document();
    doc.add(new TextField("title", title, Field.Store.YES));
    doc.add(new StringField("isbn", isbn, Field.Store.YES));
    w.addDocument(doc);
  }
}