Problem with searching is taking too much time

I got problem with searching. Simple search is taking more than 10 seconds.

Im using Amazon EC2 and have two instance with 8GB RAM and 4 Cores (So 16GB RAM and 8 cores) . Im using PHP SDK.

The case went search is taking 10 sec:
I have XML feed from which im reading *item*. My process is to read the *item, *check if exist and then save it. I call elasticsearch 4 times per second, which is working really nice. After I set 6 times per second searching go slower.I start debugging and checking the *item *is taking more then 10 sec. Im using paramedic for monitoring and is saying GREEN STATUS.
How can I fix this ?


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