public void releaseGroup(Group group, boolean success, RequestDuration searchTime) {
        synchronized (this) {
            GroupStatus sched = scoreboard.get(group.id());
            sched.release(success, searchTime);
        }
    }
Release an allocation given by {@link #takeGroup}. The release must be done exactly once for each allocation.

@param group previously allocated group
@param success was the query successful
@param searchTime query execution time, used for adaptive load balancing
container-search/src/main/java/com/yahoo/search/dispatch/LoadBalancer.java