void registerStageFinished(@NotNull StructuredIdeActivity parentActivity,
                               @Nullable StructuredIdeActivity childActivity,
                               @NotNull IndexingFinishType finishType) {
    }
void registerStageFinished(@NotNull StructuredIdeActivity parentActivity,
                               @Nullable StructuredIdeActivity childActivity,
                               @NotNull IndexingFinishType finishType)