public ReservedInstance withReservedInstanceId(String reservedInstanceId) {
        setReservedInstanceId(reservedInstanceId);
        return this;
    }
<p>
The unique identifier for the reservation.
</p>

@param reservedInstanceId
       The unique identifier for the reservation.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-opensearch/src/main/java/com/amazonaws/services/opensearch/model/ReservedInstance.java