@Override
                public void getConfig(ProtonConfig.Builder builder) {
                    if (age != null) builder.pruneremoveddocumentsage(age);
                    if (interval != null) builder.pruneremoveddocumentsinterval(interval);
                }
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