This file is indexed.

/usr/share/postgresql/9.5/timezonesets/Indian.txt is in postgresql-9.5 9.5.14-0ubuntu0.16.04.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# NOTE:
#   This file is NOT loaded by the PostgreSQL database.  It just serves as
#   a template for timezones you could need.  See the `Date/Time Support'
#   appendix in the PostgreSQL documentation for more information.
#
# src/timezone/tznames/Indian.txt
#

CCT     23400    # Cocos Islands Time (Indian Ocean) (obsolete)
CXT     25200    # Christmas Island Time (Indian Ocean) (obsolete)
EAT     10800    # East Africa Time
                 #     (Africa/Addis_Ababa)
                 #     (Africa/Asmera)
                 #     (Africa/Dar_es_Salaam)
                 #     (Africa/Djibouti)
                 #     (Africa/Kampala)
                 #     (Africa/Khartoum)
                 #     (Africa/Mogadishu)
                 #     (Africa/Nairobi)
                 #     (Indian/Antananarivo)
                 #     (Indian/Comoro)
                 #     (Indian/Mayotte)
IOT     Indian/Chagos  # British Indian Ocean Territory (Chagos) (obsolete)
MUT     14400    # Mauritius Island Time (obsolete)
MUST    18000 D  # Mauritius Island Summer Time (obsolete)
MVT     18000    # Maldives Island Time (obsolete)
RET     14400    # Reunion Time (obsolete)
SCT     14400    # Seychelles Time (obsolete)
TFT     18000    # Kerguelen Time (obsolete)