Why can't I set master.node?

I just downloaded the latest ES version off thewebsite and I can't set a node to master/data. If I add the line required, it crashes.

Whats going on here?

Exactly what are you trying to do? Exactly how does it crash? Presumably it gives an error message of some kind.

Please always be specific when you ask questions.

I have made this post before and I didnt get solved.

All I'm trying to do is create a small topology of 1 master node and a data node. Assigning master.node: true to the file causes it to crash.
Am I missing something obvious?

When I run the service:

● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Thu 2016-10-06 09:37:50 BST; 1s ago

Log file for the cluster:

[2016-10-05 16:23:45,119][WARN ][bootstrap                ] If you are logged in interactively, you will have to re-login for the new limits to take effect.
[2016-10-05 16:23:45,337][INFO ][node                     ] [Batman] version[2.4.1], pid[15630], build[c67dc32/2016-09-27T18:57:55Z]
[2016-10-05 16:23:45,338][INFO ][node                     ] [Batman] initializing ...
[2016-10-05 16:23:46,046][INFO ][plugins                  ] [Batman] modules [reindex, lang-expression, lang-groovy], plugins [], sites []
[2016-10-05 16:23:46,062][INFO ][env                      ] [Batman] using [1] data paths, mounts [[/ (/dev/mapper/master--node--vg-root)]], net usable_space [9.7gb], net total_space [15.1gb], spins? [possibly], types [ext4]
[2016-10-05 16:23:46,067][INFO ][env                      ] [Batman] heap size [1.9gb], compressed ordinary object pointers [true]
[2016-10-05 16:23:48,445][INFO ][node                     ] [Batman] initialized
[2016-10-05 16:23:48,451][INFO ][node                     ] [Batman] starting ...
[2016-10-05 16:23:48,551][INFO ][transport                ] [Batman] publish_address {}, bound_addresses {}
[2016-10-05 16:23:48,561][INFO ][discovery                ] [Batman] Gotham/36ogjJMhS0OHTt2iiDTb0Q
[2016-10-05 16:23:51,729][INFO ][cluster.service          ] [Batman] new_master {Batman}{36ogjJMhS0OHTt2iiDTb0Q}{}{}, reason: zen-disco-join(elected_as_master, [0] joins received)
[2016-10-05 16:23:51,781][INFO ][http                     ] [Batman] publish_address {}, bound_addresses {}
[2016-10-05 16:23:51,782][INFO ][node                     ] [Batman] started
[2016-10-05 16:23:51,806][INFO ][gateway                  ] [Batman] recovered [0] indices into cluster_state
[2016-10-05 16:27:10,746][INFO ][node                     ] [Batman] stopping ...
[2016-10-05 16:27:10,759][INFO ][node                     ] [Batman] stopped
[2016-10-05 16:27:10,759][INFO ][node                     ] [Batman] closing ...
[2016-10-05 16:27:10,763][INFO ][node                     ] [Batman] closed


    [2016-10-05 16:19:37,398][INFO ][node                     ] [Phantom Eagle] version[2.4.1], pid[15517], build[c67dc32/2016-09-27T18:57:55Z]
    [2016-10-05 16:19:37,399][INFO ][node                     ] [Phantom Eagle] initializing ...
    [2016-10-05 16:19:38,059][INFO ][plugins                  ] [Phantom Eagle] modules [reindex, lang-expression, lang-groovy], plugins [], sites []
    [2016-10-05 16:19:38,077][INFO ][env                      ] [Phantom Eagle] using [1] data paths, mounts [[/ (/dev/mapper/master--node--vg-root)]], net usable_space [9.7gb], net total_space [15.1gb], spins? [possibly], types [ext4]
    [2016-10-05 16:19:38,077][INFO ][env                      ] [Phantom Eagle] heap size [1015.6mb], compressed ordinary object pointers [true]
    [2016-10-05 16:19:40,888][INFO ][node                     ] [Phantom Eagle] initialized
    [2016-10-05 16:19:40,890][INFO ][node                     ] [Phantom Eagle] starting ...
    [2016-10-05 16:19:41,048][INFO ][transport                ] [Phantom Eagle] publish_address {}, bound_addresses {[::1]:9300}, {}
    [2016-10-05 16:19:41,059][INFO ][discovery                ] [Phantom Eagle] elasticsearch/qSngXdAbQKC-TIehAdkRgQ
    [2016-10-05 16:19:44,145][INFO ][cluster.service          ] [Phantom Eagle] new_master {Phantom Eagle}{qSngXdAbQKC-TIehAdkRgQ}{}{}, reason: zen-disco-join(elected_as_master, [0] joins received)