If you are receiving this error while running crawler, please check on the API configuration on your crawler ensure that the API is not restricted to specific index only.
More information about API key configuration can be read below:
https://www.algolia.com/doc/tools/crawler/apis/configuration/api-key/
Once you have made the necessary adjustment to allow the API key to crawl on different indices, there should be an option to either:
1) "retry using the same configuration"
2) cancel the crawler and reindex
If you are using option 1, you might still be facing the same error (as the crawler is trying to run from old configuration which your key may still have the restriction). In this case, it's best to try cancelling the crawler and reindex it so it picks up the latest configuration.