public void setExecutionRoleName(String executionRoleName) {
        this.executionRoleName = executionRoleName;
    }
<p>
The name of the IAM execution role to use to update the stack set. If you do not specify an execution role,
CloudFormation uses the <code>AWSCloudFormationStackSetExecutionRole</code> role for the stack set operation.
</p>
<p>
Specify an IAM role only if you are using customized execution roles to control which stack resources users and
groups can include in their stack sets.
</p>
<p>
If you specify a customized execution role, CloudFormation uses that role to update the stack. If you do not
specify a customized execution role, CloudFormation performs the update using the role previously associated with
the stack set, so long as you have permissions to perform operations on the stack set.
</p>

@param executionRoleName
       The name of the IAM execution role to use to update the stack set. If you do not specify an execution
       role, CloudFormation uses the <code>AWSCloudFormationStackSetExecutionRole</code> role for the stack set
       operation.</p>
       <p>
       Specify an IAM role only if you are using customized execution roles to control which stack resources
       users and groups can include in their stack sets.
       </p>
       <p>
       If you specify a customized execution role, CloudFormation uses that role to update the stack. If you do
       not specify a customized execution role, CloudFormation performs the update using the role previously
       associated with the stack set, so long as you have permissions to perform operations on the stack set.
aws-java-sdk-cloudformation/src/main/java/com/amazonaws/services/cloudformation/model/UpdateStackSetRequest.java