Your logs says that you don't have an instance of Elasticsearch running. Every time you pause your lab environment, you need to rerun all the process you had before like Kibana and Elasticsearch.
You can see the instruction in how to start Elasticsearch at Lab 1.2:
Thanks Tamara. Sorry for the silent because I just some time to catch up with my study now. How would I check if both Elasticsearch and Kibana are running? I'm getting the 502 gateway error and see attached for the Elasticsearch errors. Thanks.
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