Creating a cluster action
In the previous recipe, we saw how to create a REST entry point but, to execute the action at cluster level, we need to create a cluster action.
An ElasticSearch action is generally executed and distributed in the cluster; in this recipe, we will see how to implement this kind of action. The cluster's action will be a bare minimum; we will send a string with a value for every shard, and the shards echo a resultant string, which is a concatenation of the string with the shard number.
Getting ready
You need a working ElasticSearch node, a Maven build tool, and an optional Java IDE. The code of this recipe is available in the chapter12/rest_plugin directory.
How to do it...
In this recipe, we will see that a REST call is converted ...
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