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Spring Data Implementation for Elasticsearch

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/*
 * Copyright 2021-2024 the original author or authors.
 *
 * Licensed 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
 *
 *      https://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.springframework.data.elasticsearch.core.index;

import java.util.AbstractMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.springframework.data.elasticsearch.support.DefaultStringObjectMap;
import org.springframework.util.Assert;

/**
 * class defining the settings for an index.
 *
 * @author Peter-Josef Meisch
 * @since 4.2
 */
public class Settings extends DefaultStringObjectMap {

	public Settings() {}

	public Settings(Map map) {
		super(map);
	}

	/**
	 * Creates a {@link Settings} object from the given JSON String
	 *
	 * @param json must not be {@literal null}
	 * @return Settings object
	 */
	public static Settings parse(String json) {
		return new Settings().fromJson(json);
	}

	@Override
	public String toString() {
		return "Settings: " + toJson();
	}

	@Override
	public Object get(Object key) {
		return containsKey(key) ? super.get(key) : path(key.toString());
	}

	/**
	 * Merges some other settings onto this one. Other has higher priority on same keys.
	 *
	 * @param other the other settings. Must not be {@literal null}
	 * @since 4.4
	 */
	public void merge(Settings other) {

		Assert.notNull(other, "other must not be null");

		deepMerge(this, other);
	}

	/*
	 * taken from https://stackoverflow.com/a/29698326/4393565
	 */
	@SuppressWarnings("unchecked")
	private static Map deepMerge(Map original, Map newMap) {
		for (Object key : newMap.keySet()) {
			if (newMap.get(key) instanceof Map && original.get(key) instanceof Map) {
				Map originalChild = (Map) original.get(key);
				Map newChild = (Map) newMap.get(key);
				original.put(key.toString(), deepMerge(originalChild, newChild));
			} else if (newMap.get(key) instanceof List && original.get(key) instanceof List) {
				List