@Override
    public int hashCode() {
        return Objects.hash(currentReplicas, targetReplicas, done);
    }
@param currentReplicas The current replicas.
@param targetReplicas  The target replicas.
@param done            True if the reassignment is done.
tools/src/main/java/org/apache/kafka/tools/reassign/PartitionReassignmentState.java