This issue can arise on multiple situations, but it can be resolved by following this doc: 
You'll need to configure your extractor and make sure that it respects its website DOM structure to be able to be parsed by the Crawler.
The free DocSearch plan, doesn't include technical web support from the Support team. For further assistance, you can post your question on the Algolia Community Forum or Discord. For front-end issues, you can raise the issue directly on GitHub. In addition, you can review our DocSearch Documentation and FAQ.