// check relation Persistent Layer -> Index
// If current workspace is system, then need to invoke reader correspondent to system index
IndexReader indexReader = getIndexReader(isSystem);
ItemData root = itemStateManager.getItemData(Constants.ROOT_UUID);
ItemDataIndexConsistencyVisitor visitor = new ItemDataIndexConsistencyVisitor(itemStateManager, indexReader);
root.accept(visitor);
Set<String> documentUUIDs = visitor.getIndexedNodes();
// check relation Index -> Persistent Layer
// find document that do not corresponds to real node