@Override
    public void visitMembers(ObjectVisitor visitor) {
        super.visitMembers(visitor);
        visitor.visit("rank", rank);
        visitor.visit("context", context);
    }
Sets the context object of this hit. This is not serialized, and is merely a tag used by the QRS.

@param context The context to set.
@return This, to allow chaining.
searchlib/src/main/java/com/yahoo/searchlib/aggregation/Hit.java