Bootstrap checks failed while upgrading 5.6 to 6.3

Hello, I am upgrading ES cluster from version 5.6 to 6.3 and facing the below issue. I tried to set up everything as per recommendation but still getting below error. Can someone please help with that?

[2018-07-03T11:05:32,694][INFO ][o.e.x.m.j.p.l.CppLogMessageHandler] [controller/27644] [] controller (64 bit): Version 6.3.0 (Build 0f0a34c67965d7) Copyright (c) 2018 Elasticsearch BV
[2018-07-03T11:05:33,036][DEBUG][o.e.a.ActionModule       ] Using REST wrapper from plugin
[2018-07-03T11:05:33,290][INFO ][o.e.d.DiscoveryModule    ] [bsa-test-vm-03] using discovery type [zen]
[2018-07-03T11:05:34,096][INFO ][o.e.n.Node               ] [bsa-test-vm-03] initialized
[2018-07-03T11:05:34,097][INFO ][o.e.n.Node               ] [bsa-test-vm-03] starting ...
[2018-07-03T11:05:34,293][INFO ][o.e.t.TransportService   ] [bsa-test-vm-03] publish_address {}, bound_addresses {[::]:9300}
[2018-07-03T11:05:34,316][INFO ][o.e.b.BootstrapChecks    ] [bsa-test-vm-03] bound or publishing to a non-loopback address, enforcing bootstrap checks
[2018-07-03T11:05:34,319][ERROR][o.e.b.Bootstrap          ] [bsa-test-vm-03] node validation exception
[1] bootstrap checks failed
[1]: memory locking requested for elasticsearch process but memory is not locked
[2018-07-03T11:05:34,322][INFO ][o.e.n.Node               ] [bsa-test-vm-03] stopping ...
[2018-07-03T11:05:34,414][INFO ][o.e.n.Node               ] [bsa-test-vm-03] stopped
[2018-07-03T11:05:34,414][INFO ][o.e.n.Node               ] [bsa-test-vm-03] closing ...
[2018-07-03T11:05:34,426][INFO ][o.e.n.Node               ] [bsa-test-vm-03] closed
[2018-07-03T11:05:34,429][INFO ][o.e.x.m.j.p.NativeController] Native controller process has stopped - no new native processes can be started

Thanks in advance.

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About your problem Please read

Thanks, I format the code now. Apologize, its my first post so few things are missed. I read the post and verified and all looks okay but still it is failing.

What did you change to fix:

[1]: memory locking requested for elasticsearch process but memory is not locked

? Did you apply this:

Yeah, I did that but still facing the same issue. Below is the configuration for my /etc/security/limits.conf.

elasticsearch - memlock unlimited

add the as i know need restart machine.

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