Add a couple of questions

exercises/eflk.md

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+## ELK + Filebeat
+
+Set up the following using any log you would like:
+
+* Run the following: elasticsearch, logstash, kibana and filebeat (each running in its own containre)
+* Make filebeat transfer a log to logstash for process
+* Once logstash is done, index with elasticsearch
+* Finally, make sure data is available in Kibana