Node Discovery Frequency Only send to one node.

[Gatusko]

Currently I have this configuration :

HttpClientConfig.Builder builder =
    new HttpClientConfig.Builder(address) // http://elasticsearch:9200-- > Load balance that will point to another three elasticaserchs
        .connTimeout(connTimeout)
        .readTimeout(readTimeout)
        .defaultMaxTotalConnectionPerRoute(maxInFlightRequests)
        .discoveryEnabled(true)
        .discoveryFrequency(discoveryFrecuency, TimeUnit.SECONDS)
        .multiThreaded(true);

And I have another 3 nodes of elasticsaerch example :
http://0.0.0.1:9200 , http://0.0.0.2:9200, http://0.0.0.3:9200

MY question in here is that only one node is getting the load instead of making a balance for example only node 1 is getting the data. The other two are only sync up.

Do I need to set up in the Builder the three nodes or only one ?
IT is the normal behaviour of this?

The background of this is that in my cluster I saw only IO in one ES.