Unable to resolve project from metadata server for GCE discovery service – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to retrieve project information from the Google Compute Engine (GCE) metadata server. This is typically due to incorrect configuration or network issues preventing communication with the GCE metadata server. To resolve this issue, you can verify your GCE configuration, ensure that your Elasticsearch instance has the necessary permissions to access the GCE metadata server, and check your network settings to ensure that there are no firewalls or other security measures blocking access to the GCE metadata server.

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This guide will help you check for common problems that cause the log ” unable to resolve project from metadata server for GCE discovery service ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: metadata, plugins, discovery-gce, discovery.

Log Context

Log “unable to resolve project from metadata server for GCE discovery service” classname is GceInstancesServiceImpl.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        try {
            // this code is based on a private GCE method: {@link com.google.cloud.ServiceOptions#getAppEngineProjectIdFromMetadataServer()}
            return getAppEngineValueFromMetadataServer("/computeMetadata/v1/project/project-id");
        } catch (Exception e) {
            logger.warn("unable to resolve project from metadata server for GCE discovery service"; e);
        return null;

    private List resolveZones() {


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