SearcherManager not seeing changes in IndexWriter

[Boris Petrov <bo...@live.com>]

Hi all,

I'm using Lucene version 7.5.0. We have a test that does something like:

Thread 1:

            Field idStringField = new StringField("id", id,
Field.Store.YES);
            Field contentsField = new TextField("contents", reader);
            Document document = new Document();
            document.add(idStringField);
            document.add(contentsField);

            writer.updateDocument(new Term(ID_FIELD, id), document);
            writer.flush(); // not sure this flush is needed?
            writer.commit();

Thread 2:

            searchManager.maybeRefreshBlocking();
            IndexSearcher searcher = searchManager.acquire();
            try {
                QueryParser parser = new QueryParser("contents", analyzer);
                Query luceneQuery = parser.parse(queryText);
                ScoreDoc[] hits = searcher.search(luceneQuery,
50).scoreDocs;
            } finally {
                searchManager.release(searcher);
            }

Thread 1 happens before Thread 2.

Sometimes, only sometimes, the commit from thread 1 is not *immediately*
visible in Thread 2. If I put a "Thread.sleep(1000)" it always works.
Without it, sometimes the search is empty. I'm not sure if I'm doing
something wrong or this is a bug?

Thanks!