@Override
      protected void collectAggregatedData(long lookupFinishedAtMs) {
        final long lookupDurationMs = lookupFinishedAtMs - lookupStartedAtMs;
        IndexOperationAggregatesCollector.recordStubEntriesByKeysLookup(indexId, lookupFailed, lookupDurationMs);
      }
@Override
      protected void collectAggregatedData(long lookupFinishedAtMs)