Magento 2.2.5 The itemprop attribute was specified, but the element is not a property of any item

Does anyone have any idea what I need to add in order to solve the issues for the following piece of code?:

<div class="product-info-main">     <div class="product attribute overview">         <div class="value" itemprop="description">             KISS KISS BANG BANG         </div>     </div>     <div class="product-info-price">         <div class="page-title-wrapper product">             <h1 class="page-title"><span class="base" data-ui-id="page-title-wrapper" itemprop="name">FAUX FUR TEDDY COAT</span></h1>         </div>         <div class="price-box price-final_price" data-price-box="product-id-9586" data-product-id="9586" data-role="priceBox">             <span class="normal-price"><span class="price-container price-final_price tax weee" itemprop="offers" itemscope itemtype="http://schema.org/Offer"><span class="price-wrapper" data-price-amount="350" data-price-type="finalPrice" id="product-price-9586"><span class="price">€350.00</span></span></span></span>             <meta content="350" itemprop="price">             <meta content="EUR" itemprop="priceCurrency">         </div>     </div> </div> 

The errors are for the following pieces of code:

<div class="value" itemprop="description">KISS K...  <span class="base" data-ui-id="page-title-wrapper" itemprop="name">...  <span class="price-container price-final_price tax weee" itemprop="offers" itemscope itemtype="http://schema.org/Offer">...  <meta itemprop="price" content="350" />...      <meta itemprop="priceCurrency" content="EUR" />... 

catalog_category_product_index table empty (Magento 2.2.5)

Our indexer re-fills the table catalog_category_product_index_store1, but the table catalog_category_product_index remains empty.

I have found this issue https://github.com/Smile-SA/elasticsuite/issues/991 , but even after an upgrade of the smile/elasticsuite module to 2.5.13, the table remains empty.

In some of our development environments, the table is filled. But when I truncate it and reindex, it stays empty.

This is how I reindex:

bin/magento indexer:reindex catalog_product_category 

Any ideas?