please include function ai_addWebToIndex.

static void ai_removeWebFromIndex(MultiMap<S, WebNode> index, Web web) {
  if (web != null)
    for (WebNode node : web_nodesAndRelations(web))
      for (S text : asSet(node.texts()))
        index.remove(shorten(text, ai_addWebToIndex_maxLength), node);
}