Issues running three node cluster

Elastic Stack Elasticsearch
1

Elasticsearch version: (6.2.1)
OS: Unix
I am attempting to start a 3 node cluster
I have two issues/questions in regards to my configuration.

This is my first configuration in the elasticsearch.yml file

node.name: 127x16
path.logs: //home/dmaul/569/machines/16/logs
path.data: //home/dmaul/569/machines/16/data
network.host: 129.65.221.26
discovery.zen.ping.uincast.hosts: ["127x16", "127x17", "127x18"]

The other nodes are named 127x17 and 127x18.
(I realize I will want to have the discovery.zen.minimum_master_nodes to avoid split brain, however at this point I am just trying to get a running cluster and not too worried about efficiency)

With the above configuration, I receive the first stack trace labelled "STACK 1 of 2" below. According to the Elasticsearch documentation my syntax: "discovery.zen.ping.uincast.hosts: ["127x16", "127x17", "127x18"]" should work. However, the bootstrap seems to not accept that line.

My secondary question is in regards to my configuration when I remove discovery.zen.ping.uincast.hosts: ["127x16", "127x17", "127x18"].
So now in elasticsearch.yml file:

node.name: 127x16
path.logs: //home/dmaul/569/machines/16/logs
path.data: //home/dmaul/569/machines/16/data
network.host: 129.65.221.26

Again with the other nodes named 127x17 and 127x18.

I receive a different Stack trace, labeled "STACK 2 of 2" below.
According to the documentation, to address the two listed bootstrap issues I must update admin config files in the following way:

To address [1] (increasing max file descriptors):
I added this line to my /etc/security/limits.conf:
elasticsearch - nofile 70000

To address [2] (increase virtual memory):
I added this line to my /etc/sysctl.conf:
vm.max_mao_count=262144

But even with both of those files changed I still get this issue.

//STACK 1 of 2**************************************************

[2018-02-27T14:40:04,700][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [127x16] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalArgumentException: unknown setting [discovery.zen.ping.uincast.hosts] please check that any required plugins are installed, or check the breaking changes documentation for removed settings
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:125) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:112) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.2.1.jar:6.2.1]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.2.1.jar:6.2.1]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:92) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:85) ~[elasticsearch-6.2.1.jar:6.2.1]
Caused by: java.lang.IllegalArgumentException: unknown setting [discovery.zen.ping.uincast.hosts] please check that any required plugins are installed, or check the breaking changes documentation for removed settings
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:346) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:310) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:284) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.common.settings.SettingsModule.(SettingsModule.java:134) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.node.Node.(Node.java:331) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.node.Node.(Node.java:246) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:213) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:213) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:323) ~[elasticsearch-6.2.1.jar:6.2.1]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:121) ~[elasticsearch-6.2.1.jar:6.2.1]
... 6 more

//*****************************************************************

//STACK 2 of 2*****************************************************

ERROR: [2] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65536]
[2]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
[2018-02-27T15:07:09,937][INFO ][o.e.n.Node ] [127x16] stopping ...
[2018-02-27T15:07:10,010][INFO ][o.e.n.Node ] [127x16] stopped
[2018-02-27T15:07:10,010][INFO ][o.e.n.Node ] [127x16] closing ...
[2018-02-27T15:07:10,025][INFO ][o.e.n.Node ] [127x16] closed

//************************************************************************

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