# How to Deploy Spring on Upsun Fixed with Elasticsearch

To activate Elasticsearch and then have it accessed by the Spring application already in Upsun Fixed, it is necessary to modify two files.

**Note**: 

This guide only covers the addition of a service configuration to an existing Spring project already configured to deploy on Upsun Fixed. Please see the [deployment guide](https://fixed.docs.upsun.com/guides/spring/deploy.md) for more detailed instructions for setting up app containers and initial projects.

## 1. Add the Elasticsearch service

In your [service configuration](https://fixed.docs.upsun.com/add-services.md), include Elasticsearch with a [valid supported version](https://fixed.docs.upsun.com/add-services/elasticsearch.md):

      .platform/services.yaml

        ```yaml {}
elasticsearch:
    type: elasticsearch:7.10
    disk: 256
```

## 2. Add the Elasticsearch relationship

In your [app configuration](https://fixed.docs.upsun.com/create-apps/app-reference/single-runtime-image.md), use the service name `searchelastic` to grant the application access to Elasticsearch via a relationship:

      .platform.app.yaml

        ```yaml {}
relationships:
    elasticsearch: "elasticsearch:elasticsearch"
```

## 3. Export connection credentials to the environment

Connection credentials for Elasticsearch, like any service, are exposed to the application container through the `PLATFORM_RELATIONSHIPS` environment variable from the deploy hook onward. Since this variable is a base64 encoded JSON object of all of your project's services, you'll likely want a clean way to extract the information specific to Elasticsearch into it's own environment variables that can be used by Spring. On Upsun Fixed, custom environment variables can be defined programmatically in a `.environment` file using `jq` to do just that:

```bash  {location=".environment"}
export ES_HOST="$(echo "$PLATFORM_RELATIONSHIPS" | base64 --decode | jq -r '.essearch[0].host')"
export ES_PORT="$(echo "$PLATFORM_RELATIONSHIPS" | base64 --decode | jq -r '.essearch[0].port')"
export SPRING_ELASTICSEARCH_REST_URIS="http://${ES_HOST}:${ES_PORT}"
export JAVA_OPTS="-Xmx$(jq .info.limits.memory /run/config.json)m -XX:+ExitOnOutOfMemoryError"
```

**Tip**: 

For access to more credentials options, check [Spring common application properties](https://docs.spring.io/spring-boot/docs/current/reference/html/application-properties.md)
and [binding from environment variables](https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.md#features.external-config.typesafe-configuration-properties.relaxed-binding.environment-variables).

## 4. Connect to Elasticsearch

Commit that code and push. The Elasticsearch instance is ready to be connected from within the Spring application.