private static @NotNull Collection<String> getMissingKeys(@NotNull YAMLMapping mapping, @NotNull YamlMetaType metaClass) {
    Set<String> existingKeys = mapping.getKeyValues().stream().map(it -> it.getKeyText().trim()).collect(Collectors.toSet());
    return metaClass.computeMissingFields(existingKeys);
  }
private static @NotNull Collection<String> getMissingKeys(@NotNull YAMLMapping mapping, @NotNull YamlMetaType metaClass)