generator-jhipster: App with Elasticsearch doesn't work out-of-the-box with Heroku

Overview of the issue

I’m updating 21-Points Health as part of the JHipster Mini-Book. When I deploy to Heroku, it fails to configure the Elasticsearch add-on. I experienced a similar issue when I updated the book for JHipster v5.

When I run jhipster heroku, it does mention something about Elasticsearch in that “no new Elasticsearch addon created”.

Provisioning addons

Provisioning database addon heroku-postgresql --as DATABASE

No suitable cache addon for cacheprovider ehcache available.

Creating Heroku deployment files
    force .yo-rc-global.json
   create Procfile
    force .yo-rc.json
   create system.properties
   create gradle/heroku.gradle
 conflict build.gradle
? Overwrite build.gradle? (ynarxdeiH) No new Elasticsearch addon created
? Overwrite build.gradle? overwrite this and all others

When I tail the logs after startup, it basically says the Bonsai Elasticsearch add-on wasn’t configured.

2022-05-13T15:31:15.077985+00:00 app[web.1]: Caused by: java.net.UnknownHostException: 
  ${BONSAI_URL}: Name or service not known

I tried installing the add-on manually:

$ heroku addons:create bonsai:sandbox-6
Creating bonsai:sandbox-6 on ⬢ health-by-points... free
Your Bonsai cluster is being provisioned.

Please run `heroku addons:open bonsai` and navigate to the Notifications tab to enter contact information for this resource.

Please contact support@bonsai.io for help.
bonsai-clean-03403 is being created in the background. The app will restart when complete...
Use heroku addons:info bonsai-clean-03403 to check creation progress
Use heroku addons:docs bonsai to view documentation

Then, I ran heroku restart. Now it fails with:

... app[web.1]: Caused by: org.elasticsearch.ElasticsearchException: Invalid or missing build flavor [oss]
... app[web.1]: at org.elasticsearch.client.RestHighLevelClient.performClientRequest(RestHighLevelClient.java:2084)
... app[web.1]: at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1732)
... app[web.1]: at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1717)
... app[web.1]: at org.elasticsearch.client.IndicesClient.exists(IndicesClient.java:963)
... app[web.1]: at org.springframework.data.elasticsearch.core.RestIndexTemplate.lambda$doExists$2(RestIndexTemplate.java:103)
... app[web.1]: at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.execute(ElasticsearchRestTemplate.java:408)

If I google the error, I land at https://github.com/elastic/elasticsearch/issues/76091.

Motivation for or Use Case

Elasticsearch + Heroku should work out-of-the-box.

Reproduce the error

Create a new app with Elasticsearch and deploy it to Heroku with jhipster heroku.

Related issues

We experienced a similar issue in June 2018: https://github.com/jhipster/generator-jhipster/issues/7810

Suggest a Fix

Fix the Heroku sub-generator so it works.

JHipster Version(s)

twenty-one-points@0.0.1-SNAPSHOT /Users/mraible/dev/21-points
└── generator-jhipster@7.8.1

JHipster configuration, a .yo-rc.json file generated in the root folder

{
  "generator-jhipster": {
    "applicationType": "monolith",
    "authenticationType": "jwt",
    "baseName": "TwentyOnePoints",
    "blueprints": [],
    "buildTool": "gradle",
    "cacheProvider": "ehcache",
    "clientFramework": "angularX",
    "clientPackageManager": "npm",
    "clientTheme": "none",
    "clientThemeVariant": "",
    "creationTimestamp": 1651460089159,
    "cypressCoverage": false,
    "databaseType": "sql",
    "devDatabaseType": "h2Disk",
    "devServerPort": 4200,
    "dtoSuffix": "DTO",
    "enableGradleEnterprise": false,
    "enableHibernateCache": true,
    "enableSwaggerCodegen": false,
    "enableTranslation": true,
    "entitySuffix": "",
    "herokuAppName": "health-by-pints",
    "herokuDeployType": "git",
    "herokuJavaVersion": "11",
    "jhiPrefix": "jhi",
    "jhipsterVersion": "7.8.1",
    "jwtSecretKey": "YourJWTSecretKeyWasReplacedByThisMeaninglessTextByTheJHipsterInfoCommandForObviousSecurityReasons",
    "languages": ["en", "fr"],
    "messageBroker": false,
    "nativeLanguage": "en",
    "otherModules": [],
    "packageName": "org.jhipster.health",
    "pages": [],
    "prodDatabaseType": "postgresql",
    "reactive": false,
    "searchEngine": "elasticsearch",
    "serverPort": "8080",
    "serverSideOptions": ["searchEngine:elasticsearch"],
    "serviceDiscoveryType": "no",
    "skipCheckLengthOfIdentifier": false,
    "skipFakeData": false,
    "skipUserManagement": false,
    "testFrameworks": ["cypress"],
    "websocket": false,
    "withAdminUi": true
  }
}

JDL for the Entity configuration(s) entityName.json files generated in the .jhipster directory

Environment and Tools

openjdk version “17.0.3” 2022-04-19 OpenJDK Runtime Environment GraalVM CE 22.1.0 (build 17.0.3+7-jvmci-22.1-b06) OpenJDK 64-Bit Server VM GraalVM CE 22.1.0 (build 17.0.3+7-jvmci-22.1-b06, mixed mode, sharing)

git version 2.32.0 (Apple Git-132)

node: v16.15.0

npm: 8.6.0

Docker version 20.10.14, build a224086

Docker Compose version v2.5.0

Browsers and Operating System

Chrome and macOS Monterey

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