logstash - How to performance debug elasticsearch -

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i got set (not me) cluster (actually, 1 machine) collects logstash logs web application. logs flow isn't extremely active it's low/middle loaded web application. however, of time elasticsearch process takes 100% cpu; memory doesn't seems issue however, there's lot of free memory on instance.

i can start guessing wrong, tinkering cluster settings , index analysers , on, i'm wondering:

is there reliable way find performance bottleneck without guessing, i.e. built-in tool says takes resources?


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