@Override
    public String toString() {
        StringBuilder b = new StringBuilder("search ");
        b.append(super.toString());
        return b.toString();
    }
Returns an unmodifiable list of the searchers this search chain executs, in resolved execution order.
This includes all inherited (and not excluded) searchers.
container-search/src/main/java/com/yahoo/search/searchchain/SearchChain.java