unable to delete document via the IndexWriter.deleteDocuments(term) method

[Armnotstrong]

Hi, all:

I am Using version 5.5.4, and find can't delete a document via the
IndexWriter.deleteDocuments(term) method.

Here is the test code:

import org.apache.lucene.analysis.core.SimpleAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.FieldType;
import org.apache.lucene.index.*;
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.search.ScoreDoc;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

import java.io.IOException;
import java.nio.file.Paths;

public class TestSearch {
    static SimpleAnalyzer analyzer = new SimpleAnalyzer();

    public static void main(String[] argvs) throws IOException, ParseException {
        generateIndex("5836962b0293a47b09d345f1");
        query("5836962b0293a47b09d345f1");
        delete("5836962b0293a47b09d345f1");
        query("5836962b0293a47b09d345f1");

    }

    public static void generateIndex(String id) throws IOException {
        Directory directory = FSDirectory.open(Paths.get("/tmp/test/lucene"));
        IndexWriterConfig config = new IndexWriterConfig(analyzer);
        IndexWriter iwriter = new IndexWriter(directory, config);
        FieldType fieldType = new FieldType();
        fieldType.setStored(true);
        
fieldType.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS);
        Field idField = new Field("_id", id, fieldType);
        Document doc = new Document();
        doc.add(idField);
        iwriter.addDocument(doc);
        iwriter.close();

    }

    public static void query(String id) throws ParseException, IOException {
        Query query = new QueryParser("_id", analyzer).parse(id);
        Directory directory = FSDirectory.open(Paths.get("/tmp/test/lucene"));
        IndexReader ireader  = DirectoryReader.open(directory);
        IndexSearcher isearcher = new IndexSearcher(ireader);
        ScoreDoc[] scoreDoc = isearcher.search(query, 100).scoreDocs;
        for(ScoreDoc scdoc: scoreDoc){
            Document doc = isearcher.doc(scdoc.doc);
            System.out.println(doc.get("_id"));
        }
    }

    public static void delete(String id){
        try {
             Directory directory =
FSDirectory.open(Paths.get("/tmp/test/lucene"));
            IndexWriterConfig config = new IndexWriterConfig(analyzer);
            IndexWriter iwriter = new IndexWriter(directory, config);
            Term term = new Term("_id", id);
            iwriter.deleteDocuments(term);
            iwriter.commit();
            iwriter.close();
        }catch (IOException e){
            e.printStackTrace();
        }
    }
}


-- 
========================================
best regards & a nice day
Zhao Ximing

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