This file is indexed.

/usr/share/postgresql/10/extension/pg_freespacemap.control is in postgresql-10 10.6-0ubuntu0.18.04.1.

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The actual contents of the file can be viewed below.

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# pg_freespacemap extension
comment = 'examine the free space map (FSM)'
default_version = '1.2'
module_pathname = '$libdir/pg_freespacemap'
relocatable = true