Elasticsearch Stuff

Cluster health

GET _cat/health?v
GET _cat/shards?v
GET _cat/nodes?v
GET _cat/recovery?v

Search for 'index' in the recovery output to see re-index jobs e.g. after node replacements

Snapshots

GET /_snapshot
GET /_snapshot/<name>/*

Running tasks

GET /_tasks
GET /_tasks/<name>:<num>

'reindex' tasks are maybe worth looking at before carrying out cluster work.