@Override
                public void getConfig(ProtonConfig.Builder builder) {
                    if (time > 0) {
                        builder.index.warmup.time(time);
                        builder.index.warmup.unpack(unpack);
                    }
                }
Class representing the tuning config used for a search cluster.
Take a look at proton.def and vespa doc for detailed explanations.

@author geirst
config-model/src/main/java/com/yahoo/vespa/model/search/Tuning.java