public void setQualifier(String qualifier) {
        this.qualifier = qualifier;
    }
<p>
(Optional) Specify an Lambda function version or alias name. If you specify a function version, the operation
uses the qualified function Amazon Resource Name (ARN) to invoke a specific Lambda function. If you specify an
alias name, the operation uses the alias ARN to invoke the Lambda function version to which the alias points.
</p>

@param qualifier
       (Optional) Specify an Lambda function version or alias name. If you specify a function version, the
       operation uses the qualified function Amazon Resource Name (ARN) to invoke a specific Lambda function. If
       you specify an alias name, the operation uses the alias ARN to invoke the Lambda function version to which
       the alias points.
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/MaintenanceWindowLambdaParameters.java