public UpdateStackSetRequest withOperationId(String operationId) {
        setOperationId(operationId);
        return this;
    }
<p>
The unique ID for this stack set operation.
</p>
<p>
The operation ID also functions as an idempotency token, to ensure that CloudFormation performs the stack set
operation only once, even if you retry the request multiple times. You might retry stack set operation requests
to ensure that CloudFormation successfully received them.
</p>
<p>
If you don't specify an operation ID, CloudFormation generates one automatically.
</p>
<p>
Repeating this stack set operation with a new operation ID retries all stack instances whose status is
<code>OUTDATED</code>.
</p>

@param operationId
       The unique ID for this stack set operation.</p>
       <p>
       The operation ID also functions as an idempotency token, to ensure that CloudFormation performs the stack
       set operation only once, even if you retry the request multiple times. You might retry stack set operation
       requests to ensure that CloudFormation successfully received them.
       </p>
       <p>
       If you don't specify an operation ID, CloudFormation generates one automatically.
       </p>
       <p>
       Repeating this stack set operation with a new operation ID retries all stack instances whose status is
       <code>OUTDATED</code>.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-cloudformation/src/main/java/com/amazonaws/services/cloudformation/model/UpdateStackSetRequest.java