This file is indexed.

/usr/share/postgresql/10/extension/pg_trgm--1.0--1.1.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_trgm/pg_trgm--1.0--1.1.sql */

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

ALTER OPERATOR FAMILY gist_trgm_ops USING gist ADD
        OPERATOR        5       pg_catalog.~ (text, text),
        OPERATOR        6       pg_catalog.~* (text, text);

ALTER OPERATOR FAMILY gin_trgm_ops USING gin ADD
        OPERATOR        5       pg_catalog.~ (text, text),
        OPERATOR        6       pg_catalog.~* (text, text);