- An index is broken down, stored, and processed as a collection of shards
- Shards are allocated to nodes and are searched independently
- A type used to be a mechanism to store different data in the same index and has been deprecated
- Searching within index, between index and between shards adds no overhead, almost
- A score for search results calculated at the index level
- Mapping for document's properties are defined at the index level
- Search and aggregation can be executed at index, alias, multi-index, or at cluster levels
- With v6 and onwards Elastic has dropped support for multiple types in the same index
- You will come across
typewhen searching for online information