@Override
    public Set<String> getSearchFields() throws UnsupportedOperationException {
        return new LinkedHashSet<>(Arrays.asList("Username", "Name", "Email"));
    }
Default implementation of the UserProvider interface, which reads and writes data
from the {@code ofUser} database table.<p>

Passwords can be stored as plain text, or encrypted using Blowfish. The
encryption/decryption key is stored as the Openfire property {@code passwordKey},
which is automatically created on first-time use. It's critical that the password key
not be changed once created, or existing passwords will be lost. By default
passwords will be stored encrypted. Plain-text password storage can be enabled
by setting the Openfire property {@code user.usePlainPassword} to {@code true}.

@author Matt Tucker
xmppserver/src/main/java/org/jivesoftware/openfire/user/DefaultUserProvider.java