CAT Commands

Question 1

What are CAT commands

Answer 1

CAT stands for Compact and Aligned Text. The CAT API provides information about the cluster in a human-readable format

Question 2

Health of cluster

Answer 2

GET _cat/health?v

Question 3

Cluster Nodes

Answer 3

GET _cat/nodes?v

Question 4

Cluster Indices, Shards

Answer 4

GET _cat/indices?v
GET _cat/shards?v

Question 5

Count

Answer 5

GET _cat/count?v
GET _cat/count/my_index?v
Count of documents in cluster or index

Question 6

Segments

Answer 6

Provides details about index segments, such as the number of segments per index, memory used, and file sizes.
GET _cat/segments?v

Question 7

Parameters

Answer 7

The v parameter in the examples above includes headers in the output.
The h parameter allows you to specify specific columns to display, e.g., ?h=index,shards,docs.count.
The s parameter allows sorting by a specified column, e.g., ?s=shards.

Question 8

Repositories

Answer 8

Lists the snapshot repositories configured in the cluster.
GET _cat/repositories?v