public PutAutoScalingPolicyResult withClusterId(String clusterId) {
        setClusterId(clusterId);
        return this;
    }
<p>
Specifies the ID of a cluster. The instance group to which the automatic scaling policy is applied is within this
cluster.
</p>

@param clusterId
       Specifies the ID of a cluster. The instance group to which the automatic scaling policy is applied is
       within this cluster.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/PutAutoScalingPolicyResult.java