The recent introduction of the rankFusion methods to the IAggregateFluent interface has resulted in API compatibility validation failures. This is because adding new methods to an interface can be disruptive to users. To address this issue, the current solution is to temporarily relocate these methods to the extension class for IAggregateFluent. The plan is to reintroduce them to the IAggregateFluent interface with the release of version 4.0.