This file is indexed.

/usr/share/postgresql/10/tsearch_data/hunspell_sample_num.dict is in postgresql-10 10.6-0ubuntu0.18.04.1.

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

The actual contents of the file can be viewed below.

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book/302,301,202,303
booking/303,201
footballklubber
foot/101,303
football/101
ball/303,101,305
klubber/101
sky/304