This file is indexed.

/usr/share/tesseract-ocr/tessdata/configs/pdf is in libtesseract-data 3.04.01-5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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tessedit_create_txt 0
tessedit_create_pdf 1
tessedit_pageseg_mode 1