Drush command to fully clear indexed items from Solr server (not just locally)

katlion → changed the visibility of the branch 3529563-drush-command-to to hidden.

katlion → changed the visibility of the branch 3529563-delete-all-items-command to hidden.

Thanks for your patch. But the similar command already exists in the search_api_solr_admin submodule:
https://git.drupalcode.org/project/search_api_solr/-/blob/4.x/modules/se...

I think the great functions and commands in Search API Solr Admin (search_api_solr_admin) module should be moved into Search API Solr module itself, and available by default, since many users often miss that the feature or commands they are looking for already exist.

The delete-all command is a crucial tool, and I use it all the time for development and testing, as well as deployment on the server, like this:
drush search-api-solr:delete-all solr_server && drush search-api:index

I know the argumentation why Search API Solr Admin is in its own separate module (to guard the user from making a mistake), but I think it's the responsibility of the user to be careful, when running Drush commands.

After all, you can just as easily do much, much damage, like destroying a Drupal installation with a multitude of commands -- for example simply by running drush site:install -y, and Boom!, your web site is now gone.