default List<PartitionId> sortByDisruptions(List<PartitionId> partitionIds) {
    return partitionIds;
  }
Batches operations by partition by merging operations from all replicas in the local datacenter.

@param partitionIds List of partitions to process
@return A map of PartitionId to a list of merged DisruptionOperations
ambry-prioritization/src/main/java/com/github/ambry/replica/prioritization/disruption/DisruptionService.java