clarify ActualizationIndex ownership (#11247)

Author: zverevgeny

ydb/core/tx/columnshard/engines/storage/granule/granule.cpp

@@ -130,7 +130,7 @@ TGranuleMeta::TGranuleMeta(
         PathId, owner.GetStoragesManager(), versionedIndex.GetLastSchema()->GetIndexInfo().GetPrimaryKey());
     OptimizerPlanner = versionedIndex.GetLastSchema()->GetIndexInfo().GetCompactionPlannerConstructor()->BuildPlanner(context).DetachResult();
     AFL_VERIFY(!!OptimizerPlanner);
-    ActualizationIndex = std::make_shared<NActualizer::TGranuleActualizationIndex>(PathId, versionedIndex);
+    ActualizationIndex = std::make_unique<NActualizer::TGranuleActualizationIndex>(PathId, versionedIndex);
 }
 
 void TGranuleMeta::UpsertPortionOnLoad(const std::shared_ptr<TPortionInfo>&& portion) {

ydb/core/tx/columnshard/engines/storage/granule/granule.h

@@ -123,7 +123,7 @@ class TGranuleMeta: TNonCopyable {
     std::shared_ptr<TGranulesStat> Stats;
     std::shared_ptr<IStoragesManager> StoragesManager;
     std::shared_ptr<NStorageOptimizer::IOptimizerPlanner> OptimizerPlanner;
-    std::shared_ptr<NActualizer::TGranuleActualizationIndex> ActualizationIndex;
+    std::unique_ptr<NActualizer::TGranuleActualizationIndex> ActualizationIndex;
     mutable TInstant NextActualizations = TInstant::Zero();
 
     NGranule::NPortionsIndex::TPortionsIndex PortionsIndex;