Magento Version : 2.2.3
ElasticSuite Version : 2.5
Environment : Developer
Third party modules :
Did I missed something?
Fear that you don't really undestand the purpose of this settings.
It allow to suggest attribute valuesin autocomplete.
In the following screenshot attribute material and color have been set to "is_displayed_in_autocomplete" :

Having the short description suggested this way is a non sense and it seems that you want to be able to use short_description in the product template instead.
To do it you should add the short description to the Smile\ElasticsuiteCatalog\Model\Autocomplete\Product\AttributeConfig.
You can do it by creating a etc/frontend/di.xml file in your own module / namespace with the following content :
<type name="Smile\ElasticsuiteCatalog\Model\Autocomplete\Product\AttributeConfig">
<arguments>
<argument name="additionalSelectedAttributes" xsi:type="array">
<item name="short_description">short_description</item>
</argument>
</arguments>
</type>
Think this issue can be closed because of the above response.
Great!
You have an error in the code snippe , I had to add xsi:type="string" on the item tag (otherwise it will throw an error)
<type name="Smile\ElasticsuiteCatalog\Model\Autocomplete\Product\AttributeConfig">
<arguments>
<argument name="additionalSelectedAttributes" xsi:type="array">
<item name="short_description" xsi:type="string">short_description</item>
</argument>
</arguments>
</type>
Thank you!
Most helpful comment
Great!
You have an error in the code snippe , I had to add xsi:type="string" on the item tag (otherwise it will throw an error)
Thank you!