public void setFileSystemId(String fileSystemId) {
        this.fileSystemId = fileSystemId;
    }
<p>
(Optional) If you provide a <code>FileSystemId</code>, EFS returns all access points for that file system;
mutually exclusive with <code>AccessPointId</code>.
</p>

@param fileSystemId
       (Optional) If you provide a <code>FileSystemId</code>, EFS returns all access points for that file system;
       mutually exclusive with <code>AccessPointId</code>.
aws-java-sdk-efs/src/main/java/com/amazonaws/services/elasticfilesystem/model/DescribeAccessPointsRequest.java