A. Add the indexer IP address to the trusted IP list on the FortiWeb.
B. Add the indexer IP address to the FortiGuard "Known Search Engines" category.
C. Create a firewall rule to bypass the FortiWeb entirely for the indexer IP address.
D. Do not allow any external sites to index your websites.
Explanation:
The easiest way to allow a search engine indexer (such as Googlebot or Bingbot) to index your website on a FortiWeb is to add the indexer's IP address to the trusted IP list. This ensures that traffic from trusted indexers is allowed through without being blocked or interfered with by FortiWeb's security features like bot protection.