Is it possible to use search api attachments to index files that are not attachments?

hi,
it is possible to not use nodes and only search in medias (Media entity)
i'd suggest to use one of the contrib modules to bulk upload your files as media entities first
didn't test but there is : https://www.drupal.org/project/media_bulk_upload → and https://www.drupal.org/project/simple_media_bulk_upload →

here is a tutorial that can go to README file if ok:

SIMPLE USAGE EXAMPLE 3: PURE MEDIA FILE INDEX
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0) This is tested with :
drupal 9.3.0-beta3
search_api 8.x-1.x
search_api_attachments 8.x-1.x

1) Install drupal, media, search_api search_api_db and search_api_attachments.

2) Go to media/add and add some pdf Document files.

3) Configure the extractor at admin/config/search/search_api_attachments and Go
to admin/config/search/search-api/add-server and add server 'My server'
(my_server) with the default Database Backend.

4) Go to admin/config/search/search-api/add-index and add a new index 'My index'
(my_index) with 'Media' as Data source and 'My server' as Server.
Limit the bundles indexed on Document

5) Go to admin/config/search/search-api/index/my_index/processors and enable
the File attachments processor.

6) Go to admin/config/search/search-api/index/my_index/fields/add/nojs and:
- in the General section, add the "Search api attachments: Document (saa_field_media_document)" field.

7) Go to /admin/config/search/search-api/index/my_index/fields to configure
"Search api attachments: Document" to Fulltext.

8) Go to admin/structure/views/add and add a Page view:
- View name: SAA
- View settings:Show: Index My index
- Page settings: Check Create a page with title and path 'saa' that
displays "Rendered entity" format.
("Search results" format seems not working for now)

9) Add a filter to the view: the 'Fulltext search' with
- Operator : Contains any of these words
- Check the Expose checkbox
Select the "Search api attachments: Document" in "Searched fields" Section.

10) Go to admin/structure/views/view/saa and in the "Exposed Form" section (in
the ADVANCED section), hit the 'Basic' link and choose 'Input required'
so that the view doesn't display any default results.

11) Go to admin/config/search/search-api/index/my_index and Index items.

12) Go to /saa and search for any term in the pdf files :)

Automatically closed - issue fixed for 2 weeks with no activity.