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Integrations tests in this plugin require working GCE configuration and therefore disabled by default. To enable tests prepare a config file elasticsearch.yml with the following content:
cloud: gce: project_id: es-cloud zone: europe-west1-a discovery: seed_providers: gce
zone with your settings.
To run test:
mvn -Dtests.gce=true -Dtests.config=/path/to/config/file/elasticsearch.yml clean test