By default, Algolia will index these attributes from the Magento databse. Attributes not included on that list can be added via the configuration in the Algolia Search > Products > Attribute section.
Customization is advisable if the attribute:
* is not listed in the configuration
* requires on-the-fly data
* has Algolia specific attributes
For more information on customization or how to add an attribute specifically for Algolia, please refer to this documentation.
Please note that support with customizations is out-of-scope for Algolia's Support team.