Change record status: 
Project: 
Introduced in branch: 
8.x-1.x
Introduced in version: 
8.x-1.4
Description: 

The getEntityTypes() method was added to \Drupal\search_api\IndexInterface, returning all entity types contained in the index (keyed by the IDs of the datasources providing them). This method was already available as \Drupal\search_api\Plugin\views\query\SearchApiQuery::getEntityTypes(), but just from within Views. That method was therefore deprecated and will subsequently be removed in a later version of the module.

Impacts: 
Module developers