The Magento extension caps the max record size to 10kb by default.
If your Algolia plan includes a higher max record size allowance, you can increase this value in the extension.
For extension version 3.9.1 and later you can do that in the Admin panel of your Magento project, go to Stores > Algolia Search > Credentials and Basic Setup > Advanced to open the configuration page for Algolia.
Enter the value for Max record size limit per record as per your requirement.
Click Save Config at the top right to save your configuration.
If you are using an older version of the extension, you will need to upgrade in order to adjust this setting. You can follow this guide outlining how to upgrade your Algolia extension and view the release notes here. (We always recommend upgrading your dev environment first to make sure there are no unexpected issues.)