Hi again,
I could have found a workaround but there is a problem with relative link:
I upload pdf files in standard wp media library and index search works fine (in search bar I can find my results)
but results can link to: attachment file, attachment page or attachment parent post.
I’ve tried to use another plugin to customize media link, but in this case too, the link is stored in _postmeta table.
If there is a way to use a custom link (and custom image too) should be a valid workaround
(I know that pdf files should be uploaded twice but I don’t see any other solution)
Thank you