@Override
    public boolean equals(final Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        final ExplorerNode that = (ExplorerNode) o;
        return Objects.equals(uniqueKey, that.uniqueKey);
    }
@return True if this node's set of {@link NodeFlag}s is missing ALL the flags in nodeFlags.
stroom-core-shared/src/main/java/stroom/explorer/shared/ExplorerNode.java