- App Side Joins: replace post with get, and two types in one index is no more possible
- Exercise setup, add step-by-step for putty users. Missing instructions for import key and ubuntu username
- List consideration es vs. a db (maybe in the extras)
- Mapping: broken formatting code snippet, expand on multi-field with id and id.keyword
- IndexTypeApi: broken code snippet
- In the labs, replace bullet points with numbers
- Chapter 4: drop the aggregation data slide
- Add a slide for docker hub