public String getCreationToken() {
        return this.creationToken;
    }
<p>
(Optional) Restricts the list to the file system with this creation token (String). You specify a creation token
when you create an Amazon EFS file system.
</p>

@return (Optional) Restricts the list to the file system with this creation token (String). You specify a
        creation token when you create an Amazon EFS file system.
aws-java-sdk-efs/src/main/java/com/amazonaws/services/elasticfilesystem/model/DescribeFileSystemsRequest.java