These are some resources to explore Elastic as a Speed Layer (a fast, scalable search and analytics layer on top of existing legacy data systems).
logstash_batch_export.conf
An example of batch loading of records from MySQL to Elasticsearch
dev_console.json
A lab for Kibana's Dev Console
kibana_objects.ndjson
Importable Kibana objects (dashboard, visualizations, index pattern)
Everything was made in Elastic Stack 7.3.