Lab 16: Explain use of Elastic in Index section

[rgstephens]

Describe the tutorial you would like to see here
At this point in the tutorial we state that we're going to start Elastic but not why we're doing this. What's the objective of this Index section of the lab?

[x] I've checked the existing tutorials

[TuanaCelik]

Thank you @rgstephens - we're updating the tutorials one by one. I'll keep this issue here until we get to this particular one 🙏🏽