Before you can use the Elastic Stack machine learning features, there are some configuration requirements (such as security privileges) that must be addressed. Refer to Setup and security.
To use the machine learning features to analyze your data, you can create an anomaly detection job and send your data to that job.
The results of machine learning analysis are stored in Elasticsearch and you can use Kibana to help you visualize and explore the results.
After you learn how to create and stop anomaly detection jobs, you can check the Examples for more advanced settings and scenarios.
Consult Working with anomaly detection at scale to learn more about the particularities of large anomaly detection jobs.
Intro to Kibana
ELK for Logs & Metrics