**Checking the cluster health**
```
GET /_cat/health?v
```
**Listing the cluster's nodes**
```
GET /_cat/nodes?v
```
**Listing the cluster's indices**
```
GET /_cat/indices?v
```
**Checking the shard allocation**
```
GET /_cat/allocation?v
```
**Checking which nodes contain which shards**
```
GET /_cat/shards?v
```