Apache Lucene Sort Issues with GAE-Lucene addDocuments

[vamsipkris]

I have been trying to get Sort working for Apache Lucene and Google App Engine. Here is what I am doing

I have a list of Documents, which I am putting into Lucene using the IndexWriter using addDocuments() method.

for(Object object : objects) {
    Document doc = new Document();
    document.add(new Field("id", generateDocId(object), idType));
    document.add(new NumericDocValuesField("sortLong",));
    documents.add(doc)
}

I am basically aggregating all the documents into a list and writing to index using

IndexWriter writer = getWriter();
writer.addDocuments(documents);

I am trying to query a few documents, based on some Query as well as Sort

Sort sort = new Sort(new SortField("sortLong", SortField.Type.LONG, true));
TopFieldDocs docs = searcher.search(new MatchAllDocsQuery(),2000,sort);

Problem:

When I use addDocuments to bulk index the documents, my Sort Queries are not returning the data in the correct Sort Order, basically they are wrong, however if I index each document using addDocument(), the Sort Queries are working correctly.

This has led me to deduce that there is something inherently wrong with addDocuments(). The sort wont work unless, I open the indexWriter, addDocument and Close the indexWriter. Which I am unwilling to do, because I have may thousands of records to index.

Is there any solution for this problem? Or is it a known defect.