This file is indexed.

/usr/share/tesseract-ocr/tessdata/configs/linebox is in libtesseract3 3.02.01-2.

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_resegment_from_line_boxes 1
tessedit_make_boxes_from_boxes 1