/*
 * 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.indices;

import org.elasticsearch.index.Index;
import org.elasticsearch.index.IndexException;
import org.elasticsearch.rest.RestStatus;

/**
 * Thrown when some action cannot be performed because the primary shard of
 * some shard group in an index has not been allocated post api action.
 */
public class IndexPrimaryShardNotAllocatedException extends IndexException {

    public IndexPrimaryShardNotAllocatedException(Index index) {
        super(index, "primary not allocated post api");
    }

    @Override
    public RestStatus status() {
        return RestStatus.CONFLICT;
    }
}

@@ -1386,16 +1386,29 @@
 tus.
-CONFLICT
+INTERNAL_SERVER_ERROR
 ;%0A  

Change IndexPrimaryShardNotAllocatedException from 409 (RestStatus.CONFLICT) to 500 (RestStatus.INTERNAL_SERVER_ERROR)