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Elasticsearch 7 support for Hazelcast Jet

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/*
 * Copyright 2023 Hazelcast Inc.
 *
 * Licensed under the Hazelcast Community License (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://hazelcast.com/hazelcast-community-license
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.jet.elastic;

import com.hazelcast.function.FunctionEx;
import com.hazelcast.function.SupplierEx;
import com.hazelcast.jet.pipeline.Sink;
import org.elasticsearch.action.DocWriteRequest;
import org.elasticsearch.client.RestClientBuilder;

import javax.annotation.Nonnull;

/**
 * Provides factory methods for Elasticsearch sinks.
 * Alternatively you can use {@link ElasticSinkBuilder}
 *
 * @since Jet 4.2
 */
public final class ElasticSinks {

    private ElasticSinks() {
    }

    /**
     * Creates an Elasticsearch sink, uses a local instance of Elasticsearch
     * 
     * Usage:
     * 
{@code Sink> sink = ElasticSinks.elastic(
     *   map -> new IndexRequest("my-index").source(map)
     * );}
     *
     * @param mapToRequestFn function that maps an item from a pipeline
     *                       to an indexing request
     */
    @Nonnull
    public static  Sink elastic(
            @Nonnull FunctionEx> mapToRequestFn
    ) {
        return elastic(ElasticClients::client, mapToRequestFn);
    }

    /**
     * Creates an Elasticsearch sink, uses a client obtained from
     * clientFn and maps items using given mapToRequestFn
     * 
     * Usage:
     * 
Sink> sink = ElasticSinks.elastic(
     *   () -> ElasticClients.client("es-host", 9200),
     *   map -> new IndexRequest("my-index").source(map)
     * );
     *
     * @param clientFn       supplier function returning configured RestClientBuilder
     * @param mapToRequestFn function that maps an item from a pipeline to an indexing request
     * @param             type of incoming items
     */
    @Nonnull
    public static  Sink elastic(
            @Nonnull SupplierEx clientFn,
            @Nonnull FunctionEx> mapToRequestFn
    ) {
        // Avoid ElasticSinkBuilder inferred from mapToRequestFn
        ElasticSinkBuilder builder = new ElasticSinkBuilder<>()
                .clientFn(clientFn)
                .mapToRequestFn(mapToRequestFn);
        return builder.build();
    }

    /**
     * Returns new instance of {@link ElasticSinkBuilder}
     */
    @Nonnull
    public static ElasticSinkBuilder builder() {
        return new ElasticSinkBuilder<>();
    }

}