Elasticsearch (Search Service)

Elasticsearch is a distributed RESTful search engine built for the cloud.

See the Elasticsearch documentation for more information.

Supported versions

• 0.90
• 1.4
• 1.7
• 2.4
• 5.2

Relationship

The format exposed in the $PLATFORM_RELATIONSHIPS environment variable:

{
    "elasticsearch": [
        {
            "host": "248.0.65.198",
            "scheme": "http",
            "port": "9200"
        }
    ]
}

Usage example

In your .platform/services.yaml:

mysearch:
    type: elasticsearch:5.2
    disk: 1024

In your .platform.app.yaml:

relationships:
    elasticsearch: "mysearch:elasticsearch"

You can then use the service in a configuration file of your application with something like:

<?php
// This assumes a fictional application with an array named $settings.
if (getenv('PLATFORM_RELATIONSHIPS')) {
    $relationships = json_decode(base64_decode($relationships), TRUE);

    // For a relationship named 'elasticsearch' referring to one endpoint.
    if (!empty($relationships['elasticsearch'])) {
        foreach ($relationships['elasticsearch'] as $endpoint) {
            $settings['elasticsearch_host'] = $endpoint['host'];
            $settings['elasticsearch_port'] = $endpoint['port'];
            break;
        }
    }
}

note

When you create an index on Elasticsearch, you should not specify number_of_shards and number_of_replicas settings in your Elasticsearch API call. These values will be set automatically based on available resources.

Plugins

The Elasticsearch 2.4 and later services offer a number of plugins. To enable them, list them under the configuration.plugins key in your services.yaml file, like so:

mysearch:
    type: "elasticsearch:5.2"
    disk: 1024
    configuration:
        plugins:
            - analysis-icu
            - lang-python

In this example you'd have the ICU analysis plugin and Python script support plugin.

If there is a publicly available plugin you need that is not listed here, please contact our support team.

Available plugins

This is the complete list of official Elasticsearch plugins that can be enabled:

Upgrading

The Elasticsearch data format sometimes changes between versions in incompatible ways. Elasticsearch does not include a data upgrade mechanism as it is expected that all indexes can be regenerated from stable data if needed. To upgrade (or downgrade) Elasticsearch you will need to use a new service from scratch.

There are two ways of doing that.

Destructive

In your services.yaml file, change the version of your Elasticsearch service and its name. Then update the name in the .platform.app.yaml relationships block.

When you push that to Platform.sh, the old service will be deleted and a new one with the name name created, with no data. You can then have your application reindex data as appropriate.

This approach is simple but has the downside of temporarily having an empty Elasticsearch instance, which your application may or may not handle gracefully, and needing to rebuild your index afterward. Depending on the size of your data that could take a while.

Transitional

For a transitional approach you will temporarily have two Elasticsearch services. Add a second Elasticsearch service with the new version a new name and give it a new relationship in .platform.app.yaml. You can optionally run in that configuration for a while to allow your application to populate indexes in the new service as well.

Once you're ready to cut over, remove the old Elasticsearch service and relationship. You may optionally have the new Elasticsearch service use the old relationship name if that's easier for your application to handle. Your application is now using the new Elasticsearch service.

This approach has the benefit of never being without a working Elasticsearch instance. On the downside, it requires two running Elasticsearch servers temporarily, each of which will consume resources and need adequate disk space. Depending on the size of your data that may be a lot of disk space.