@ApiStatus.Experimental
  public @NotNull ModificationTracker getIndexModificationTracker(@NotNull StubIndexKey<?, ?> indexId, @NotNull Project project) {
    return () -> getIndexModificationStamp(indexId, project);
  }
@ApiStatus.Experimental
  public @NotNull ModificationTracker getIndexModificationTracker(@NotNull StubIndexKey<?, ?> indexId, @NotNull Project project)