@Override
    public final void onQueryProfile(QueryProfile profile,
                                     DimensionBinding binding,
                                     QueryProfile owner,
                                     DimensionValues variant) {
        if (prefixComponentIndex < prefix.size()) return; // Not in the prefix yet
        onQueryProfileInsidePrefix(profile, binding, owner, variant);
    }
The current prefix, relative to prefix.
container-search/src/main/java/com/yahoo/search/query/profile/PrefixQueryProfileVisitor.java