@Override
    public String[] requiredModules() {
        return new String[] {CoreModule.NAME};
    }
The storage provider for ElasticSearch 6/7 and OpenSearch 1.x.
oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/StorageModuleElasticsearchProvider.java