Profile your server and figure out what the bottleneck in your app is: https://nodejs.org/en/docs/guides/simple-profiling/ https://nodejs.org/en/docs/guides/sim

Profile your server and figure out what the bottleneck in your app is: https://nodejs.org/en/docs/guides/simple-profiling/ https://nodejs.org/en/docs/guides/simple-profiling/ Also, consider building the ElasticSearch index on another server than the one serving live traffic.