Many thanks for your response, some good points which I had not thought of,
but unfortunately the problem remains.
To clarify my index sequence in pseudo-code is this:
if( fileExists( filePath ) ){
createIndexReader();
delectDoc( docNumber );
}
createIndexWriter();
indexDoc
Yes, you can search while index writes are taking place, but
When you open an index reader, it essentially takes a snapshot
of the index and further modifications of the index are not visible to
that searcher as long as it's open. You must close and re-open the
reader (and associated searcher
