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There is a newer version: 8.13.4

/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

package org.elasticsearch.plugins;

import org.elasticsearch.index.IndexSettings;
import org.elasticsearch.index.engine.EngineFactory;

import java.util.Optional;

/**
 * A plugin that provides alternative engine implementations.
 */
public interface EnginePlugin {

    /**
     * When an index is created this method is invoked for each engine plugin. Engine plugins can inspect the index settings to determine
     * whether or not to provide an engine factory for the given index. A plugin that is not overriding the default engine should return
     * {@link Optional#empty()}. If multiple plugins return an engine factory for a given index the index will not be created and an
     * {@link IllegalStateException} will be thrown during index creation.
     *
     * @return an optional engine factory
     */
    Optional getEngineFactory(IndexSettings indexSettings);

}