Controlling cluster state via an API

The previous recipe returns information only about the health of the cluster. If you need more details on your cluster, you need to query its state.

Getting ready

You need an up-and-running Elasticsearch installation as we described in the Downloading and installing Elasticsearch recipe in Chapter 2, Downloading and Setup.

To execute curl via the command-line, you need to install curl for your operating system.

How to do it...

To check the cluster state, we will perform the following steps:

1. To view the cluster state, the HTTP method is GET, and the curl command is as follows:

           curl -XGET 'http://localhost:9200/_cluster/state' 
   

2. The result will contain the following data sections:

   General cluster information:

           {
            "cluster_name" : "es-cookbook",
            "version" : 13,
            "state_uuid" : "QANXXnzhS7aS5HxLlyNKsw",
            "master_node" : "7NwnFF1JTPOPhOYuP1AVNQ",
            "blocks" : { },

   Node address information:

           "nodes" : {
      ...