- [Go client docs](https://www.elastic.co/docs/reference/elasticsearch/clients/go/typed-api)
- [ES API docs](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get)

- Fix index names custom completion
  https://github.com/urfave/cli/issues/2332
  https://github.com/urfave/cli/issues/2333
  
- index show: add more details, see screenshots

- add shard explain, aka:
  get /_cluster/allocation/explain {"index":"yourindex", "primary": true, "shard":0}