public String getInstanceGroupId() {
        return this.instanceGroupId;
    }
<p>
Specifies the ID of the instance group to which the scaling policy is applied.
</p>

@return Specifies the ID of the instance group to which the scaling policy is applied.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/PutAutoScalingPolicyResult.java