_luceneRoot = _wgaData.getFolder(new Path(LUCENE_FOLDERNAME));
IFolder oldLuceneRoot = _wgaData.getFolder(new Path("lucene"));
if (oldLuceneRoot.exists() && !_luceneRoot.exists()) {
try {
oldLuceneRoot.refreshLocal(IResource.DEPTH_INFINITE, new NullProgressMonitor());
oldLuceneRoot.move(new Path(LUCENE_FOLDERNAME), false, new NullProgressMonitor());
} catch (CoreException e) {
WGADesignerPlugin.getDefault().logError("Unable to migrate existing lucene folder.", e);
}
}