How to increase index memory of ES

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I have 5 ES node，one master,one client,3 data node.
Each machine has 10G memory.
I have 3G data.
I join two index data via Hive and SparkSQL.
Isaw ES use 5G memory when i install the X-Pack. I execute the following:

select count(*)

This SQL will cost 45s and this index has 2 million data/200M.
This index has the following:

1V(~Y}@)WH575VEX7@{1OKS.png1169×614 19.6 KB

The index memory only 3.8MB,I want to increase the index memory.

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