I am noticing a lot of performance issues in Kibana with our Metricbeat metrics. We have 150 servers sending metric data and there are currently 375 million records in our Metricbeat index.
I reduced the frequency of the metrics from 10s to 30s in the Metricbeat config file, but I am not sure how to handle the 400 million records already in the index. None of the Metricbeat visualizations seem to load and I get "Discover: Gateway timeout" and "Metrics: error" errors. How should I proceed to fix the performance issues?