@Override
    protected void setMonitor(ResponseMonitor<SearchInvoker> monitor) {
        // never to be called
    }
Sends search queries to the contained {@link SearchInvoker} sub-invokers. If the search
query has an offset other than zero, it will be reset to zero and the expected hit amount
will be adjusted accordingly.
container-search/src/main/java/com/yahoo/search/dispatch/InterleavedSearchInvoker.java