@Override
    protected void onDeserialize(Deserializer buf) {
        super.onDeserialize(buf);
        rank = buf.getDouble(null);
    }
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