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Elasticsearch subproject :server

There is a newer version: 8.15.1

/*
 * 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.cluster.metadata.IndexTemplateMetadata;
import org.elasticsearch.cluster.metadata.Metadata;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.function.UnaryOperator;

/**
 * Upgrades {@link Metadata} on startup on behalf of installed {@link Plugin}s
 */
public class MetadataUpgrader {
    public final UnaryOperator> indexTemplateMetadataUpgraders;

    public MetadataUpgrader(Collection>> indexTemplateMetadataUpgraders) {
        this.indexTemplateMetadataUpgraders = templates -> {
            Map upgradedTemplates = new HashMap<>(templates);
            for (UnaryOperator> upgrader : indexTemplateMetadataUpgraders) {
                upgradedTemplates = upgrader.apply(upgradedTemplates);
            }
            return upgradedTemplates;
        };
    }
}