public DocumentSummary getSummary(String name) {
        var summary = summaries.get(name);
        if (summary != null) return summary;
        if (inherited.isEmpty()) return null;
        return requireInherited().getSummary(name);
    }
Returns a summary class defined by this search definition, or null if no summary with this name is defined.
The default summary, named "default" is always present.
config-model/src/main/java/com/yahoo/schema/Schema.java