class VulnerableSoftwareIndexer extends IndexManager implements ObjectIndexer<VulnerableSoftwareDocument> {

    private static final Logger LOGGER = Logger.getLogger(VulnerableSoftwareIndexer.class);
    private static final VulnerableSoftwareIndexer INSTANCE = new VulnerableSoftwareIndexer();

    static VulnerableSoftwareIndexer getInstance() {
        return INSTANCE;
    }

    /**
     * Private constructor.
     */
    private VulnerableSoftwareIndexer() {
        super(IndexType.VULNERABLESOFTWARE);
    }

    @Override
    public String[] getSearchFields() {
        return IndexConstants.VULNERABLESOFTWARE_SEARCH_FIELDS;
    }

    /**
     * Adds a VulnerableSoftware object to a Lucene index.
     *
     * @param vs A persisted VulnerableSoftware object.
     */
    public void add(final VulnerableSoftwareDocument vs) {
        final Document doc = convertToDocument(vs);
        addDocument(doc);
    }

    @Override
    public void update(final VulnerableSoftwareDocument vs) {
        final Term term = convertToTerm(vs);
        final Document doc = convertToDocument(vs);
        updateDocument(term, doc);
    }

    /**
     * Deletes a VulnerableSoftware object from the Lucene index.
     *
     * @param vs A persisted VulnerableSoftware object.
     */
    public void remove(final VulnerableSoftwareDocument vs) {
        final Term term = convertToTerm(vs);
        deleteDocuments(term);
    }

    /**
     * Re-indexes all VulnerableSoftware objects.
     */
    public void reindex() {<FILL_FUNCTION_BODY>}

    private static List<VulnerableSoftwareDocument> fetchNext(final QueryManager qm, final Long lastId) {
        final Query<VulnerableSoftware> query = qm.getPersistenceManager().newQuery(VulnerableSoftware.class);
        if (lastId != null) {
            query.setFilter("id > :lastId");
            query.setParameters(lastId);
        }
        query.setOrdering("id ASC");
        query.setRange(0, 1000);
        query.setResult("id, uuid, cpe22, cpe23, vendor, product, version");
        try {
            return List.copyOf(query.executeResultList(VulnerableSoftwareDocument.class));
        } finally {
            query.closeAll();
        }
    }

    private Document convertToDocument(final VulnerableSoftwareDocument vs) {
        final var doc = new Document();
        addField(doc, IndexConstants.VULNERABLESOFTWARE_UUID, vs.uuid().toString(), Field.Store.YES, false);
        addField(doc, IndexConstants.VULNERABLESOFTWARE_CPE_22, vs.cpe22(), Field.Store.YES, false);
        addField(doc, IndexConstants.VULNERABLESOFTWARE_CPE_23, vs.cpe23(), Field.Store.YES, false);
        addField(doc, IndexConstants.VULNERABLESOFTWARE_VENDOR, vs.vendor(), Field.Store.YES, true);
        addField(doc, IndexConstants.VULNERABLESOFTWARE_PRODUCT, vs.product(), Field.Store.YES, true);
        addField(doc, IndexConstants.VULNERABLESOFTWARE_VERSION, vs.version(), Field.Store.YES, true);
        //todo: index the affected version range fields as well
        return doc;
    }

    private static Term convertToTerm(final VulnerableSoftwareDocument vs) {
        return new Term(IndexConstants.VULNERABLESOFTWARE_UUID, vs.uuid().toString());
    }

}

        LOGGER.info("Starting reindex task. This may take some time.");
        super.reindex();

        long indexedDocs = 0;
        final long startTimeNs = System.nanoTime();
        try (QueryManager qm = new QueryManager()) {
            List<VulnerableSoftwareDocument> docs = fetchNext(qm, null);
            while (!docs.isEmpty()) {
                docs.forEach(this::add);
                indexedDocs += docs.size();
                commit();

                docs = fetchNext(qm, docs.get(docs.size() - 1).id());
            }
        }
        LOGGER.info("Reindexing of %d VulnerableSoftwares completed in %s"
                .formatted(indexedDocs, Duration.ofNanos(System.nanoTime() - startTimeNs)));
    
<methods>public void addDocument(Document) ,public static void checkIndexesConsistency() ,public void close() ,public void commit() ,public static void delete(org.dependencytrack.search.IndexManager.IndexType) ,public void deleteDocuments(Term) ,public static void ensureIndexesExists() ,public org.dependencytrack.search.IndexManager.IndexType getIndexType() ,public java.lang.String[] getSearchFields() ,public void reindex() ,public void updateDocument(Term, Document) <variables>private static final Logger LOGGER,private final non-sealed Counter addOperationCounter,private final non-sealed Counter commitOperationCounter,private final non-sealed Counter deleteOperationCounter,private Gauge docsRamTotalGauge,private final non-sealed Tag indexTag,private final non-sealed org.dependencytrack.search.IndexManager.IndexType indexType,private IndexWriter iwriter,private final non-sealed Logger logger,private Gauge numDocsGauge,private Gauge ramBytesUsedGauge,private DirectoryReader searchReader,private final non-sealed Counter updateOperationCounter