IndexWriter deleteDocuments功能不起作用

Question

public void index(IndexItem indexItem) throws IOException {
    writer.deleteDocuments(new Term(IndexItem.ID,indexItem.getId().toString()));                    
    Document doc = new Document();
    // doc.add(new LongField(IndexItem.ID, indexItem.getId(), Field.Store.YES));
    doc.add(new TextField(IndexItem.CONTENT, indexItem.getContent(), Field.Store.NO));
    doc.add(new StringField(IndexItem.PATH, indexItem.getPath(), Field.Store.YES));

    // add the document to the index
    writer.addDocument(doc, analyzer);


    writer.updateDocument(new Term(IndexItem.CONTENT, indexItem.getContent().toString()), doc);
    System.out.println(indexItem.getTitle()); 
    writer.close();
}

Here Writer.deleteDocuments is not working. Thus each time I index a file, it doest not deletes already existing file then create a new one rather it just makes a copy of it.

Is this anything have to do with work.lock file

Answer 1

You appear to have commented out the line that adds the IndexItem.ID field to the document. If that field isn't added to the document, then the call to deleteDocuments won't find any matches on that field, and nothing will be deleted.