Overview
This is a memo on how to prevent unpublished content from being indexed by Drupal’s Search API.
References
This was also documented in the following article.
https://www.acquia.com/jp/blog/introduction-to-search-api-1
Method
It was necessary to enable “Entity status” at the following location:
/admin/config/search/search-api/index/xxx/processors
Summary
We hope this serves as a useful reference.