$collection = $this->productCollectionFactory->create()
                ->addStoreFilter($this->_storeManager->getStore()->getId())
                ->addAttributeToSelect(array('name'))
                ->addAttributeToFilter(
                    [
                        ['attribute' => 'name', 'like' => '%' . $searchQuery . '%'],

                    ])
                ->addFieldToFilter('type_id', ['eq' => "sellabletype"]);

            foreach ($collection as $product) {
                $image_url = $this->image->init($product, 'product_page_image_small')->setImageFile($product->getSmallImage())->resize(200, 200)->getUrl();
                $searchCollection[] = ['name' => $product->getName(), 'url' => $product->getProductUrl(), 'image' => $image_url];
            }

$image_url = $this->image->init($product, 'product_page_image_small')->setImageFile($product->getSmallImage())->resize(200, 200)->getUrl();

$image_url = $this->image->init($product, 'product_page_image_small')->setImageFile($product->getImage())->resize(200, 200)->getUrl();

$imageUrl = $this->storeManager->getStore()->getBaseUrl(MagentoFrameworkUrlInterface::URL_TYPE_MEDIA);
$productUrl = $imageUrl.'catalog/product'.$product->getImage();

$_objectManager = MagentoFrameworkAppObjectManager::getInstance();
$imageHelper  = $_objectManager->get('MagentoCatalogHelperImage');
$product = $_objectManager->create('MagentoCatalogModelProduct')->load($product->getId());
<?php $image_url= $imageHelper->init($product, 'product_thumbnail_image')->setImageFile($product->getFile())->resize(200, 200)->getUrl(); ?>