Elk stack: Elk is the abbreviation of elasticsearch, logstash and kibana, all of which are open source software. Elk is a general term before version 5.0; it is a unified log collection and analysis system. It can be convenient for us to collect and display the logs you want.
Elastic stack: it is the new name after elk5.0 is added with beats suite. It is the abbreviation of elasticsearch, logstash and kibana. A newly added filebeat is a lightweight log collection and processing tool (agent). Filebeat takes less resources and is suitable for collecting logs on various servers and transferring them to logstash. The official also recommends this tool.
1. ElasticsearchStore data