Dropwizard Elasticsearch

A set of classes for using [Elasticsearch](version 2.3.0 and higher) in a [Dropwizard]application.

The package provides a [lifecycle-managed] (http://dropwizard.io/1.0.0/docs/manual/core.html#managed-objects) client class (ManagedEsClient), a configuration class with the most common options (EsConfiguration), and some health checks which can instantly be used in any Dropwizard application.

NOTE: We made a fork from the original project so that we could support more recent versions of Elasticsearch (5). Latest version supported is 5.6.2 (see releases).

Usage

Just add EsConfiguration to your Configuration class and create an ManagedEsClient instance in the run method of your service.

You can also add one of the existing health checks to your Environment in the same method. At least the usage of EsClusterHealthCheck is strongly advised.

public class DemoApplication extends Application<DemoConfiguration> {
    // [...]
    @Override
    public void run(DemoConfiguration config, Environment environment) {
        final ManagedEsClient managedClient = new ManagedEsClient(configuration.getEsConfiguration());
        environment.lifecycle().manage(managedClient);
        environment.healthChecks().register("ES cluster health", new EsClusterHealthCheck(managedClient.getClient()));
        // [...]
    }
}

Configuration

The following configuration settings are supported by EsConfiguration:

• nodeClient: When true, ManagedEsClient will create a NodeClient, otherwise a TransportClient; default: true
• servers: A list of servers for usage with the created TransportClient if nodeClient is false
• clusterName: The name of the Elasticsearch cluster; default: "elasticsearch"
• settings: Any additional settings for Elasticsearch, see Configuration
• settingsFile: Any additional settings file for Elasticsearch, see Configuration

An example configuration file for creating a Node Client could like this:

clusterName: MyClusterName
settings:
  node.name: MyCustomNodeName

The order of precedence is: nodeClient/servers/clusterName > settings > settingsFile, meaning that any setting in settingsFile can be overwritten with settings which in turn get overwritten by the specific settings like clusterName.

Maven Artifacts

This project is available on Maven Central. To add it to your project simply add the following dependencies to your pom.xml:

<dependency>
  <groupId>io.dropwizard.modules</groupId>
  <artifactId>dropwizard-elasticsearch</artifactId>
  <version>1.0.0-1</version>
</dependency>

Support

Please file bug reports and feature requests in GitHub issues.

Acknowledgements

Thanks to Alexander Reelsen (@spinscale) for his Dropwizard Blog Sample which sparked the idea for this project.

License

Copyright (c) 2013-2016 Jochen Schalanda

This library is licensed under the Apache License, Version 2.0.

See http://www.apache.org/licenses/LICENSE-2.0.html or the LICENSE file in this repository for the full license text.