This file is indexed.

/usr/share/postgresql/10/extension/pg_buffercache--1.2--1.3.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_buffercache/pg_buffercache--1.2--1.3.sql */

-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pg_buffercache UPDATE TO '1.3'" to load this file. \quit

GRANT EXECUTE ON FUNCTION pg_buffercache_pages() TO pg_monitor;
GRANT SELECT ON pg_buffercache TO pg_monitor;