title: How do I mark content entities as dirty in Drupal 7 Search API module
body: <p>I am using Drupal 7 with the search api. I understand that one of the 'common pitfalls' of the search api is 'Changes in related entities don't lead to re-indexing'. I am bringing in a field called 'Collection Reference' in my search api index as 'type = content' . So when the title of a collection changes the search API doesn't realise it changes.
  I have tried to sort this using the rules module as discussed - <a href="https://www.drupal.org/docs/7/modules/search-api/getting-started/common-pitfalls#indirect-changes" rel="nofollow noreferrer">https://www.drupal.org/docs/7/modules/search-api/getting-started/common-pitfalls#indirect-changes</a> - but I have not been able to get it working. Has anybody had any luck with this technique?</p>