Alternative PDF indexing method?

I've been experiencing PDF indexing issue:
https://forums.zotero.org/discussion/77153/indexing-unindexed-items#latest
and I still can't figure out what blocks PDF files from being indexed by pdfinfo.exe

>20% of my volume is unindexed and newly added items(via chrome connector) are occasionally unable to index in a similar sense, so I'm just wondering for an alternative PDF indexing method.

Is there any PDF indexing plugins or extensions other than Xpdf ones?
Or can I just index them with an external app(I know none of them though) and somehow import the info into the Zotero?

+After trying re-installing Zotero in one of my two computers with Zotero installed, #of indexed items are 'asymmetric' between two computers. Is it just a matter of time? I mean, if I just wait sufficiently long, the indices might just sync? (I enabled full-text sync option)
  • There's nothing besides the built-in indexing functionality, sorry.

    Indexing of synced full-text content happens in the background, so there can be a delay there.
  • Hmm Maybe I should by a new computer and try again :-P
    Thank you for your devoted time though.
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