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You're looking for the bundle key, which can be obtained from the entity type:
$entity_type = 'node';
// Load the entity type definition and get its keys.
$keys = \Drupal::entityTypeManager()
->getDefinition($entity_type)
->getKeys();
$query = \Drupal::entityQuery($entity_type);
// 'bundle' is optional, if not provided it will be the same as ...
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