public void setBillingSubscriptionId(Long billingSubscriptionId) {
        this.billingSubscriptionId = billingSubscriptionId;
    }
<p>
The unique identifier of the billing subscription.
</p>

@param billingSubscriptionId
       The unique identifier of the billing subscription.
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/ReservedInstance.java