Entities for search are no longer indexed immediately and now require cron to be configured

The Search API module discourages content from being indexed directly as this can make saving new content slow on larger platforms. The average Open Social platform can become pretty big due to the amount of user generated content that is encouraged. As a response to reports that content saving can be slow and on advice of the Search API module, Open Social will no longer immediately index entities when they are saved.

This means that cron should be configured to run in regular intervals to ensure the search indexes remain up to date. Cron was previously already required in order for notifications to be handled properly so this should not require any actions on most sites.