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There is a newer version: 6.2.3.31

/*
 * 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.plugins;

import java.util.Collections;
import java.util.Map;

import org.elasticsearch.index.mapper.Mapper;
import org.elasticsearch.index.mapper.MetadataFieldMapper;

/**
 * An extension point for {@link Plugin} implementations to add custom mappers
 */
public interface MapperPlugin {

    /**
     * Returns additional mapper implementations added by this plugin.
     *
     * The key of the returned {@link Map} is the unique name for the mapper which will be used
     * as the mapping {@code type}, and the value is a {@link Mapper.TypeParser} to parse the
     * mapper settings into a {@link Mapper}.
     */
    default Map getMappers() {
        return Collections.emptyMap();
    }

    /**
     * Returns additional metadata mapper implementations added by this plugin.
     *
     * The key of the returned {@link Map} is the unique name for the metadata mapper, which
     * is used in the mapping json to configure the metadata mapper, and the value is a
     * {@link MetadataFieldMapper.TypeParser} to parse the mapper settings into a
     * {@link MetadataFieldMapper}.
     */
    default Map getMetadataMappers() {
        return Collections.emptyMap();
    }
}