What is index in elasticsearch

- What is inverted index in elasticsearch
- What is index template in elasticsearch
- What is flush index in elasticsearch
- What is index rollover in elasticsearch
- What is lucene index in elasticsearch
- What is index mapping in elasticsearch
- What is index pattern in elasticsearch
- What is index name in elasticsearch
- What is index type in elasticsearch
- What is search index in elasticsearch
- What is document and index in elasticsearch
- What is index alias elasticsearch