public List<String> getSourceNames() {
        List<String> sourceNames=new ArrayList<>();
        for (SourceNode sourceNode : getSources())
            sourceNames.add(sourceNode.getSource().getId());
        return sourceNames;
    }
Returns the names of the sources returned from {@link #getSources} for convenience
container-search/src/main/java/com/yahoo/search/intent/model/IntentModel.java