public void setClientToken(String clientToken) {
        this.clientToken = clientToken;
    }
<p>
A unique, case-sensitive key supplied by the client to ensure that the request is idempotent. For more
information, see <a
href="https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Run_Instance_Idempotency.html">Ensuring
Idempotency</a>.
</p>

@param clientToken
       A unique, case-sensitive key supplied by the client to ensure that the request is idempotent. For more
       information, see <a
       href="https://docs.aws.amazon.com/AWSEC2/latest/APIReference/Run_Instance_Idempotency.html">Ensuring
       Idempotency</a>.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/ReservedInstancesModification.java