tossing in an empty array might work too. Can't remember but the module might include all classes in the index unless you tell it otherwise

it does resolve my original error but causes a 400 in my solr

Can you try this format? My Solr setup is still sketchy so I can't tell if it's working or not:

  1. [
  2. Page::class => [
  3. 'class' => Page::class,
  4. 'includeSubclasses' => true
  5. ],
  6. File::class => [
  7. 'class' => File::class,
  8. 'includeSubclasses' => true
  9. ],
  10. ]