$bestsalecollection = $this->_collectionFactory->create()->setModel(
            MagentoCatalogModelProduct::class
        )->addStoreFilter(
            $storeId
        );
        $productCollection = $this->productcollectionFactory->create();
        $sellercollection=$productCollection->addFieldToFilter('current_user_id',array('eq'=>1));
        $filter_product=[];

        foreach ($sellercollection as $allProduct){
            foreach ($bestsalecollection as $bestSale){
                if($allProduct->getEntityId()==$bestSale->getProductId()){
                    $filter_product[]=$bestSale;
                }
            }
        }
        $this->_logger->info(print_r($bestSale->getData(),true));  $this->setCollection($filter_product);
        return parent::_prepareCollection();