Elasticsearch clusters can keep running even when there are hardware failures such as node failure and network failure. In the case of node failure, it replicates all the data on the failed node to another node in the cluster. In the case of network failure, Elasticsearch seamlessly elects master replicas to keep the cluster running. Whether it is a case of node or network failure, you can rest assured that your data is safe.

Now that you know when and why Elasticsearch could be a great choice, let's take a high-level view of the ecosystem – the Elastic Stack.