This file is indexed.

/usr/share/postgresql/9.5/tsearch_data/synonym_sample.syn is in postgresql-9.5 9.5.14-0ubuntu0.16.04.

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

The actual contents of the file can be viewed below.

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postgres	pgsql
postgresql	pgsql
postgre	pgsql
gogle	googl
indices	index*