The server automatically re-enables a data-source which was disabled before and which lost enabled="false" in the configuration XML file.

There is a discrepancy between the default value of the enabled attribute in XSD and the same attribute definition in org.jboss.as.connector.subsystems.datasources.Constants. From my POV any data-source that has been disabled before should stay in that state unless it is explicitly enabled again. See https://bugzilla.redhat.com/show_bug.cgi?id=952277 for a reproducer.

The culprit seems to be

...
    private void parseDataSource(final XMLExtendedStreamReader reader, final List<ModelNode> list, final ModelNode parentAddress) throws XMLStreamException, ParserException,
            ValidateException {
...
==>        boolean enabled = Defaults.ENABLED.booleanValue();
...
    private void parseXADataSource(XMLExtendedStreamReader reader, final List<ModelNode> list, final ModelNode parentAddress) throws XMLStreamException, ParserException,
            ValidateException {
...
==>        boolean enabled = Defaults.ENABLED.booleanValue();
...

Though it looks like a bug, I am not sure we can change the default value in XSD for EAP.