Not sure if paperless could fit your need https://github.com/paperless-ngx/paperless-ngx#features
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Paperless is great. But it does not highlight the search text. The android app paperless mobile does. Another option could be zotero. It is meant for sientific papers but very powerful in handling large PDF collections. Hard to completly selfhost. But using WebDAV as storage is straightforward. Good look, let us know where you land.
I'm using it with ocr and it does highlight the search text and scrolls to it.
U r right, it does highlight in the pdf. It did not on mobile for me.
Paperwork seems to fit most of the bill except for one thing: it won't scroll to where the search hit is (but it will highlight the matching keywords).
Just beware Paperwork won't just create an index. It'll organize the PDF its own way in its own work directory.
(full disclosure: I'm its main dev)
How does Paperwork compare to Paperless?
Paperless is a web application. Paperwork is a desktop application.
Would paperless-ngx work?
A very crude solution would be to merge all PDFs into a single file and just use the search of your favourite PDF viewer.
I haven’t used any of these, but I wonder if any of the self-hosted open source document management platforms would serve your purpose? Something like PaperMerge or similar?
This sounds like it could be a job for Calibre-web.
So like self-hosted Spotlight? That would be cool
Or rather - FOSS Spotlight. I suppose it's already self hosted
Does Nextcloud search PDF contents?
Not by default, but I am relatively sure that the full text search extension does.
That's a very specific problem and I don't know if there is an existing solution that does exactly what you want.
paperless-ngx does a lot of the things you ask for, it lets you upload pdfs, does OCR and gives you full text search via a web ui. It's just not made specifically for manuals and it does not highlight the search hits or scrolls to them.
Elastic Search.
This sounds useful although I haven't tried it myself: https://stackoverflow.com/a/40614824