This file is indexed.

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

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

UPDATE pg_aggregate SET aggcombinefn = 'citext_smaller'
WHERE aggfnoid = 'min(citext)'::pg_catalog.regprocedure;