docs: protected int getDonorId(StoreRoutingPlan currentSRP,
                               StoreRoutingPlan finalSRP,
                               int stealerZoneId,
                               int stealerNodeId,
                               int stealerPartitionId) {
          int stealerZoneNAry = finalSRP.getZoneNaryForNodesPartition(stealerZoneId,
                                                                      stealerNodeId,
                                                                      stealerPartitionId);
  
          int donorZoneId;
          if(currentSRP.zoneNAryExists(stealerZoneId, stealerZoneNAry, stealerPartitionId)) {
              // Steal from local n-ary (since one exists).
              donorZoneId = stealerZoneId;
          } else {
              // Steal from zone that hosts primary partition Id.
              int currentMasterNodeId = currentSRP.getNodeIdForPartitionId(stealerPartitionId);
              donorZoneId = currentCluster.getNodeById(currentMasterNodeId).getZoneId();
          }
  
          return currentSRP.getNodeIdForZoneNary(donorZoneId, stealerZoneNAry, stealerPartitionId);
  
      }