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The Reindex module adds APIs to reindex from one index to another or update documents in place.
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/*
 * 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.reindex;

import org.elasticsearch.action.ActionListener;
import org.elasticsearch.action.support.ActionFilters;
import org.elasticsearch.action.support.HandledTransportAction;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.ParentTaskAssigningClient;
import org.elasticsearch.cluster.service.ClusterService;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.io.stream.Writeable;
import org.elasticsearch.index.reindex.BulkByScrollResponse;
import org.elasticsearch.index.reindex.BulkByScrollTask;
import org.elasticsearch.index.reindex.DeleteByQueryAction;
import org.elasticsearch.index.reindex.DeleteByQueryRequest;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.tasks.Task;
import org.elasticsearch.threadpool.ThreadPool;
import org.elasticsearch.transport.TransportService;

public class TransportDeleteByQueryAction extends HandledTransportAction {

    private final ThreadPool threadPool;
    private final Client client;
    private final ScriptService scriptService;
    private final ClusterService clusterService;

    @Inject
    public TransportDeleteByQueryAction(
        ThreadPool threadPool,
        ActionFilters actionFilters,
        Client client,
        TransportService transportService,
        ScriptService scriptService,
        ClusterService clusterService
    ) {
        super(
            DeleteByQueryAction.NAME,
            transportService,
            actionFilters,
            (Writeable.Reader) DeleteByQueryRequest::new
        );
        this.threadPool = threadPool;
        this.client = client;
        this.scriptService = scriptService;
        this.clusterService = clusterService;
    }

    @Override
    public void doExecute(Task task, DeleteByQueryRequest request, ActionListener listener) {
        BulkByScrollTask bulkByScrollTask = (BulkByScrollTask) task;
        BulkByScrollParallelizationHelper.startSlicedAction(
            request,
            bulkByScrollTask,
            DeleteByQueryAction.INSTANCE,
            listener,
            client,
            clusterService.localNode(),
            () -> {
                ParentTaskAssigningClient assigningClient = new ParentTaskAssigningClient(
                    client,
                    clusterService.localNode(),
                    bulkByScrollTask
                );
                new AsyncDeleteByQueryAction(bulkByScrollTask, logger, assigningClient, threadPool, request, scriptService, listener)
                    .start();
            }
        );
    }
}