@Override
    public void populateAccessLogEntry(final AccessLogEntry accessLogEntry) {
        super.populateAccessLogEntry(accessLogEntry);
        if (trace != null) {
            accessLogEntry.setTrace(trace);
        }
        populateAccessLogEntry(accessLogEntry, getHitCounts());
    }
Copy custom HTTP headers from the search result over to the HTTP response.

@param outputHeaders the headers which will be sent to a client
@param searchHeaders the headers from the search result, or null
container-search/src/main/java/com/yahoo/search/handler/HttpSearchResponse.java