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The Google Compute Engine (GCE) Cloud plugin allows to use GCE API for the unicast discovery mechanism.

There is a newer version: 2.4.6

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.cloud.gce;

import com.google.api.services.compute.model.Instance;
import org.elasticsearch.common.component.LifecycleComponent;

import java.io.IOException;
import java.util.Collection;

/**
 *
 */
public interface GceComputeService extends LifecycleComponent {
    final class Fields {
        public static final String PROJECT = "cloud.gce.project_id";
        public static final String ZONE = "cloud.gce.zone";
        public static final String REFRESH = "cloud.gce.refresh_interval";
        public static final String TAGS = "discovery.gce.tags";
        public static final String VERSION = "Elasticsearch/GceCloud/1.0";

        public static final String RETRY = "cloud.gce.retry";
        public static final String MAXWAIT = "cloud.gce.max_wait";
    }

    /**
     * Return a collection of running instances within the same GCE project
     * @return a collection of running instances within the same GCE project
     */
    Collection instances();

    /**
     * Gets metadata on the current running machine (call to
     * http://metadata.google.internal/computeMetadata/v1/instance/xxx).
     * For example, you can retrieve network information by replacing xxx with:
     * 
     *     `hostname` when we need to resolve the host name
     *     `network-interfaces/0/ip` when we need to resolve private IP
     * 
     * @see org.elasticsearch.cloud.gce.network.GceNameResolver for bindings
     * @param metadataPath path to metadata information
     * @return extracted information (for example a hostname or an IP address)
     * @throws IOException in case metadata URL is not accessible
     */
    String metadata(String metadataPath) throws IOException;
}