Java 500+ % CPU high usage

can please someone shed some light on how to fix this issue as seems there will be no hardware enough for this .......
i have this new HP-Prolian DL380 G9 with 16 CPU ans 16 GB memory. i have set ES_HEAP_SIZE to 8g on /etc/default/ES on my Ubuntu 16.04 but it seems useless as CPU is always more that 500 % . really appreciate any help ..

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