public void setTailcost(double tailcost) {
        if ((tailcost < 0.0) || (tailcost > 1.0)) {
            throw new IllegalInputException("tailcost must be in the range [0.0, 1.0], got " + tailcost);
        }
        this.tailcost = tailcost;
    }
Override the tail cost factor determined on the content nodes
container-search/src/main/java/com/yahoo/search/query/ranking/SoftTimeout.java