public void setReservedInstanceOfferingId(String reservedInstanceOfferingId) {
        this.reservedInstanceOfferingId = reservedInstanceOfferingId;
    }
<p>
The unique identifier of the Reserved Instance offering.
</p>

@param reservedInstanceOfferingId
       The unique identifier of the Reserved Instance offering.
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/ReservedInstance.java