Until now, we mostly talked about the different functionalities of Elasticsearch, both in terms of handling queries as well as indexing data. However, preparing Elasticsearch for high query and indexing throughput is something that we would briefly like to talk about. We start this section by mentioning some functionalities of Elasticsearch that we didn't talk until now but are pretty important when it comes to tuning your cluster. We know that it is a very concentrated knowledge, but we will try to limit it to only those things that we think are important. After discussing the functionality, we will give you general advice on how to tune the discussed functionalities and what to pay attention to. We hope that by reading this section you will be able to see which things to look for when you are tuning your cluster.