@Override
    public FeedClientBuilderImpl setCircuitBreaker(FeedClient.CircuitBreaker breaker) {
        this.circuitBreaker = requireNonNull(breaker);
        return this;
    }
Overrides default circuit breaker.
@see FeedClient.CircuitBreaker
vespa-feed-client/src/main/java/ai/vespa/feed/client/impl/FeedClientBuilderImpl.java