This file is indexed.

/usr/share/tesseract-ocr/tessdata/configs/bigram 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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load_bigram_dawg	True
tessedit_enable_bigram_correction	True
tessedit_bigram_debug	3
save_raw_choices	True
save_alt_choices	True