Getting node statistics via the API

The node statistics call API is used to collect real-time metrics of your node, such as memory usage, threads usage, number of indexes, search and so on.

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...

For getting nodes statistics, we will perform the following steps:

1. To retrieve the node statistic, the HTTP method is GET, and the curl command is as follows:

           curl -XGET 'http://localhost:9200/_nodes/stats'curl -XGET   
           'http://localhost:9200/_nodes/<nodeId1>,<nodeId2>/stats'

2. The result will be a long list of all the node statistics. The most significant parts of the results are as follows:

   A header describing the cluster name and the nodes section:

           { 
             "cluster_name" : "es-cookbook", 
      ...