Machine learning tools or plugin for elasticsearch?

can somebody tell me about machine learning tools or plugin for elasticsearch which are open source and free??

Depends very much what problem you’re trying to solve. The XPack machine learning is about anomaly detection

For search relevance, there’s the learning to rank plugin:

I have to perform log analysis and pattern finding.
So I have output from elasticsearch with type of log(i.e. error,debug,exception).
I want to detect cpu performance.

X-Pack's Machine Learning (not free) can assist with log analysis and metric analysis.

See the introduction of the product from Elastic{ON} 2017:

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