- πΊπΈUnited States caesius
Leaving a quick comment here as this is one of only two Google search results for "undefined field index_id" although my issue did not appear to be related to this (fixed) bug.
Per comment 12 on π Exception: "400" Status: undefined_field_index_id: undefined_field_index_id Fixed , uninstalling and reinstalling search_api and search_api_solr resolves "undefined field index_id" error for me on Drupal 10.
- πΊπΈUnited States joshua.boltz
I just ran into this after upgrading my Docksal Solr version from 7 to 9.3. I noticed Drupal was not indexing. Then, I noticed the 400 error about the undefined index_id.
I uninstalled the Search API Solr module and re-installed, and now it is working as expected and indexing.