Elasticsearch process memory locking failed

Elastic Stack Elasticsearch
1

I have set boostrap.memory_lock=true
Updated /etc/security/limits.conf added memlock unlimited for elastic search user

My elastic search was running fine for many months. Suddenly it failed 1 day back. In logs I can see below error and process never starts

ERROR: bootstrap checks failed
memory locking requested for elasticsearch process but memory is not locked

I hit ulimit -as and I can see max locked memory set to unlimited. What is going wrong here? I have been trying for hours but all in vain. Please help.

OS is RHEL 7.2
Elasticsearch 5.1.2

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