we have 8 clustered nodes and each nodes have 1 replica. 
total document size is about 4GB and 1,984,173 docs.

I was suffering from very high CPU usage 80%~90% every hourly.
It is held for 5 min.

there is no other process except es on each server.
there is no other cron job even at that time.

I thought there are something wrong with es process.
maybe external attacks or gc problem.. I don't know.

It happened every hourly.
I don't know what's going on elasticsearch at this time!! 
somebody help me, tell me what happened in there. please..


    $ ./elasticsearch -v 
    Version: 1.4.2, Build: 927caff/2014-12-16T14:11:12Z, JVM: 1.7.0_75 
    
    $ java -version 
    java version "1.7.0_75" 
    Java(TM) SE Runtime Environment (build 1.7.0_75-b13) 
    Java HotSpot(TM) 64-Bit Server VM (build 24.75-b04, mixed mode) 

and I installed plugins - HQ, bigdesk, head, kopf, sense

heres bigdesk graphs at cpu peak time:
<http://elasticsearch-users.115913.n3.nabble.com/file/n4072788/es_cpu_high.png> 



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