This file is indexed.

/usr/share/postgresql/9.3/extension/pgstattuple--1.0--1.1.sql is in postgresql-contrib-9.3 9.3.4-1.

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/pgstattuple/pgstattuple--1.0--1.1.sql */

-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pgstattuple UPDATE TO '1.1'" to load this file. \quit

CREATE FUNCTION pgstatginindex(IN relname regclass,
    OUT version INT4,
    OUT pending_pages INT4,
    OUT pending_tuples BIGINT)
AS 'MODULE_PATHNAME', 'pgstatginindex'
LANGUAGE C STRICT;