OCR your documents before index
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install Tesseract
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download language files from: https://github.com/tesseract-ocr/tessdata
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copy language files into /usr/share/tessdata/ (or /usr/share/tesseract-ocr/tessdata/, depends on our distribution)
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configure this app in the Full text search Admin panel
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report bugs
devblog about PDF and OCR: https://daita.github.io/files-fulltextsearch-tesseract-ocr-pdf/
