Lucene - Simple search with query

I'm trying to do searches on an index made with Lucene that was sent to me. They are simple searches that are not working ...

package portugues;

//https://lucene.apache.org/core/2_9_4/queryparsersyntax.html

import java.nio.file.Paths;

import javax.management.Query;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.store.FSDirectory;

public class Buscador {

    public static void main(String[] args) {

    IndexReader reader =   DirectoryReader.open(FSDirectory.open(Paths.get("/home/janaina/Bureau/projet_java/MyLuceneIndex")));
    IndexSearcher searcher = new IndexSearcher(reader);
    Analyzer analyzer = new StandardAnalyzer();
    QueryParser parser = new QueryParser("contents", analyzer);
    Query query1 = parser.parse("pomme");
    Query query2 = parser.parse("pomme" AND "banane");
    Query query3 = parser.parse("pomme" OR "banane");
    Query query4 = parser.parse("pomme*");


    System.out.println(query1);
    System.out.println(query2);
    System.out.println(query3);
    System.out.println(query4);

}

}

I just need to find some words using Query Parser Syntax. Sorry if the question is stupid. It's because I'm a beginner ... Thank you!