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ElasticSearch–Performance testing

When trying to load test our ElasticSearch cluster, we noticed big variations in results that we couldn’t explain based on the changes we made.

Turned out that our tests were not executed in comparable situations as we didn’t clear the ElasticSearch cache.

So before running our tests, we cleared the cache using following command:

POST /<myindexname>/_cache/clear?request=true

If you want to view what’s inside the Elastic node cache, you can use the following command::

GET /_cat/nodes?v&h=id,name,queryCacheMemory,queryCacheEvictions,requestCacheMemory,requestCacheHitCount,requestCacheMissCount,flushTotal,flushTotalTime
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