public void setCustomAmiId(String customAmiId) {
        this.customAmiId = customAmiId;
    }
<p>
The custom AMI ID to use for the provisioned instance group.
</p>

@param customAmiId
       The custom AMI ID to use for the provisioned instance group.
aws-java-sdk-emr/src/main/java/com/amazonaws/services/elasticmapreduce/model/InstanceGroup.java