This is the basic level of information that everyone should know before even thinking about the best practices or using Elastic Stack. If you learn about Elastic Stack and without thinking about your use case, you start to connect or process random data, then you will not be able to deduce proper information as required. You will always remain stranded when asked why you chose this or why not another software or tool. Hence, it becomes immensely important to understand your use case beforehand.
Your use-case primarily answers a lot of questions regarding the components to be used, the criticality of logging data flowing in, requirement of high availability clusters, and a need for centralized logging system. If your use-case comprises of analyzing the logs of an application, then you can make a decision accordingly about whether you need a single elasticsearch cluster, or if you need to create a centralized logging system.
One of the biggest questions that arises...