Ebean Find Where Child iContains?

I have models designed to store xml files:

public class FileUpload extends Model {
    @Id
    public Long id;

    public String fileName;
}

A file is simply an xml with a root and lots of parent and child nodes.

public class FileElement extends Model {
    @Id
    public Long id;

    public String name;

    public String text;

    @ManyToOne
    public FileUpload fileUpload; // Each FileElement has a reference to the FileUpload (So that I know which FileElements belong to a FileUpload).

    @OneToMany
    public List<FileElementAttribute> attributes;

    @OneToMany(mappedBy="parentElement")
    public List<FileElement> childElements;

    @ManyToOne
    public FileElement parentElement; // if parentElement == null, FileElement is a root element.
}

public class FileElementAttribute extends Model {
    @Id
    public Long id;

    public String attributeName;

    public String attributeValue;

    @ManyToOne
    public FileElement fileElement; // A Xml node can have multiple attributes.
}

This is the method I call to save an xml to the database.

public static FileElement create(Node node, FileElement parentElement, FileUpload fileUpload) {
    if (node instanceof Element) {
        FileElement fe = new FileElement();
        fe.name = node.getNodeName();
        fe.text = "";
        fe.fileUpload = fileUpload;
        fe.parentElement = parentElement;

        if(node.getChildNodes().getLength() == 1) fe.text = node.getTextContent().trim();

        fe.save();

        for (int i = 0; i < node.getAttributes().getLength(); i++) {
            FileElementAttribute fea = new FileElementAttribute();
            fea.attributeName = node.getAttributes().item(i).getNodeName();
            fea.attributeValue = node.getAttributes().item(i).getNodeValue();
            fea.fileElement = fe;
            fea.save();
        }

        for (int i = 0; i < node.getChildNodes().getLength(); i++) {
            FileElement fec = create(node.getChildNodes().item(i), fe, fileUpload);
            if (fec != null) {
                fe.childElements.add(fec);
            }
        }
        fe.update();
        return fe;
    } else {
        return null;
    }
}

This is how I use it:

FileUpload fu = new FileUpload();
fu.fileName = "First"
fu.save();

try {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document document = null;
    String file = "~/MyApp/First.xml";
    try (InputStream stream = new FileInputStream(file)) {
        document = builder.parse(stream);
    }
    Node node = document.getDocumentElement();
    FileElement.create(node, null, fu);
} catch (Exception e) {
    Logger.error(e.toString());
}

The implementation may be too complex, I am certainly open for a better implementation of this. This was written for Java EE but I am trying my hardest to implement it to play's way.

Saving an Xml document and retrieving it wasn't a problem anymore.

I am implementing a search functionality where the user keys in a String and I will use the String to query where it is equals to FileElement.text or FileElementAttribute.attributeValue.

Once I execute the query, I'm suppose to get a list of FileElement and return its unique list of FileUpload.

The question is, how am I suppose to code that?