public ReservedInstance withReservationName(String reservationName) {
        setReservationName(reservationName);
        return this;
    }
<p>
The customer-specified identifier to track this reservation.
</p>

@param reservationName
       The customer-specified identifier to track this 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