private Map<String, OperationResult<ModelMetadataKey>> getChangedMetadataKeys(Map<String, ModelMetadataKey> keyMap){
        return this.getDirectoryServiceClient().getChangedMetadataKeys(keyMap);
    }
private Map < String , OperationResult < ModelMetadataKey > > getChangedMetadataKeys ( Map < String , ModelMetadataKey > keyMap ) { return this . getDirectoryServiceClient ( ) . getChangedMetadataKeys ( keyMap ) ; }
Get the changed list for the MetadataKey from the server.

@param keyMap
the MetadataKey list.
@return
the ModelMetadataKey list that has been changed.