public String getRepoUpgradeOnBoot() {
        return this.repoUpgradeOnBoot;
    }
<p>
Applies only when <code>CustomAmiID</code> is used. Specifies the type of updates that the Amazon Linux AMI
package repositories apply when an instance boots using the AMI.
</p>

@return Applies only when <code>CustomAmiID</code> is used. Specifies the type of updates that the Amazon Linux
        AMI package repositories apply when an instance boots using the AMI.
@see RepoUpgradeOnBoot
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/Cluster.java