This file is indexed.

/usr/share/postgresql/10/extension/pg_freespacemap--1.1--1.2.sql 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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/* contrib/pg_freespacemap/pg_freespacemap--1.1--1.2.sql */

-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_freespacemap UPDATE TO '1.2'" to load this file. \quit

GRANT EXECUTE ON FUNCTION  pg_freespace(regclass, bigint) TO pg_stat_scan_tables;
GRANT EXECUTE ON FUNCTION  pg_freespace(regclass) TO pg_stat_scan_tables;