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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.action.support;

import org.apache.lucene.store.AlreadyClosedException;
import org.elasticsearch.ExceptionsHelper;
import org.elasticsearch.action.NoShardAvailableActionException;
import org.elasticsearch.action.UnavailableShardsException;
import org.elasticsearch.index.IndexNotFoundException;
import org.elasticsearch.index.shard.IllegalIndexShardStateException;
import org.elasticsearch.index.shard.ShardNotFoundException;

public class TransportActions {

    public static boolean isShardNotAvailableException(final Throwable e) {
        final Throwable actual = ExceptionsHelper.unwrapCause(e);
        return (actual instanceof ShardNotFoundException
            || actual instanceof IndexNotFoundException
            || actual instanceof IllegalIndexShardStateException
            || actual instanceof NoShardAvailableActionException
            || actual instanceof UnavailableShardsException
            || actual instanceof AlreadyClosedException);
    }

    /**
     * If a failure is already present, should this failure override it or not for read operations.
     */
    public static boolean isReadOverrideException(Exception e) {
        return isShardNotAvailableException(e) == false;
    }

}