How to tune elasticsearch performance

[dadoonet (David Pilato)]

I think it's the same thread as you already opened at

Tuning the ES performance

I am using ES to ingest flow data from other application, but I found that the speed isn't high enough, so sometimes it would drop flow. How can I change the setting of ES performance ? I have seen the elasticsearch.yml, jvm.options and log4j2.properties, but there seems no setting about ES performance. Thanks a lot.