private static boolean updateNotFound(Reply reply) {
        return       reply instanceof UpdateDocumentReply
                && ! ((UpdateDocumentReply) reply).wasFound()
                &&   reply.getMessage() instanceof UpdateDocumentMessage
                &&   ((UpdateDocumentMessage) reply.getMessage()).getDocumentUpdate() != null
                && ! ((UpdateDocumentMessage) reply.getMessage()).getDocumentUpdate().getCreateIfNonExistent();
    }
Catch message bus replies and make the available to a given session.

@author Steinar Knutsen
vespaclient-container-plugin/src/main/java/com/yahoo/vespa/http/server/FeedReplyReader.java