In this chapter, we looked at the analysis process and we reviewed the building blocks of analyzer. After this, we comprehended what the character filters, tokenizers, and token filters are, and how to specify different analyzers in separate fields. Finally, we saw how to create a custom analyzer. In the next chapter, you'll discover the anatomy of an Elasticsearch cluster, what a shard is, what a replica shard is, what a function replica shard performs, and so on. In addition, we will examine the questions, how do we configure my cluster correctly? and how do we determine the correct number of shard and replicas? We will also look at some relevant cases related to this topic.