When using Search API attachments and using Extraction method as Solr extractor and if you notice error message like "Unfortunately, the extraction doesn't seem to work with this configuration!" then please follow below mentioned steps.
Resolution for Drupal 8
Try to patch Solarium by running the following command in your Drupal docroot (the vendor folder may also be at the same level as your docroot):
cd vendor/solarium/solarium && wget https://gist.githubusercontent.com/janusman/fc7833a8598e436434899d2b369e04bb/raw/3583b2531fb90edf900e3f3b552ae4d339c40e27/solarium-patch-3.8.1-to-3.x-with-boundary-fix.patch && patch -p1 <solarium-patch-3.8.1-to-3.x-with-boundary-fix.patch
Resolution for Drupal 7
- Go to the Search API configuration page, and then click the Search API attachments tab.
- Scroll to the Solr Extraction Settings section, and in the Solr extracting servlet path field, enter