public List<Integer> isrs() {
            return isrs;
        }
Create an instance of this class with the provided parameters.
<p>
This constructor is public to make testing of <code>CreatePartitionPolicy</code> implementations easier.

@param replicas replica assignments of the partition
@param isrs     in-sync replica assignments of the partition
metadata/src/main/java/org/apache/kafka/controller/es/CreatePartitionPolicy.java