public void getConfig(ProtonConfig.Summary.Builder builder) {
                    if (cache != null) {
                        cache.getConfig(builder.cache);
                    }
                    if (logStore != null) {
                        logStore.getConfig(builder.log);
                    }
                }
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