Install Tesseract
Download and install Tesseract to convert PDF to searchable text:
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Windows: https://tesseract-ocr.github.io/tessdoc/Downloads.html
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Mac: https://formulae.brew.sh/formula/tesseract (command line: brew install tesseract)
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Ubuntu: https://ubuntuhandbook.org/index.php/2021/12/install-tesseract-ocr-5-ubuntu/
Important: INSTALLATION PATH
When installing Tesseract, ensure the installation path does not contain spaces. For example, use C:\Tesseract-OCR rather than C:\Program Files\Tesseract-OCR. A path containing spaces will cause the Tika Text Extraction task to fail to locate the Tesseract executable.
For a walk through of how to install Tesseract on windows watch this video: How to Install and Use Tesseract OCR on Windows