Handling multiple client permissions on an elastic search server

I am a newbie to this field and have very recently started looking
Elastic Search. I am having some trouble with it. This is what I am doing,
I am trying to fetch logs from client servers to a centralized server using
Logstash and then indexing them through ElasticSearch. I am using Kibana
for the UI.
This is working fine for me.
Now what I need is that when a customer(client) tries to index logs he can
only view his logs and not the logs of all the clients. Thus I need to
manage permissions for all the customers and then the admin can view logs
from all of them. How can i manage to do this. i may not be clear with it,
please ask for any details if needed.
Thanks in advance for your help.

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