private void moveNode(final DocRef parentFolderRef, final DocRef docRef) {
        final ExplorerTreeNode folderNode = getNodeForDocRef(parentFolderRef).orElse(null);
        final ExplorerTreeNode docNode = getNodeForDocRef(docRef).orElse(null);
        explorerTreeDao.move(docNode, folderNode);
    }
General form a function that returns a list of explorer nodes from the tree DAO

@param folderDocRef  The root doc ref of the query
@param fetchFunction The function to call to get the list of ExplorerTreeNodes given a root ExplorerTreeNode
@return The list of converted ExplorerNodes
stroom-explorer/stroom-explorer-impl/src/main/java/stroom/explorer/impl/ExplorerNodeServiceImpl.java