@NotNull
    public Map<IndexableSetContributor, IndexableSetContributorDescriptor> contributorsToMap() {
      LOG.assertTrue(contributors != null);
      return ContainerUtil.map2Map(contributors, descriptor -> com.intellij.openapi.util.Pair.create(descriptor.contributor, descriptor));
    }
@NotNull
    public Map<IndexableSetContributor, IndexableSetContributorDescriptor> contributorsToMap()