add back index and delete engine failure exceptions as deprecated for bwc with 5.x

core/src/main/java/org/elasticsearch/ElasticsearchException.java

@@ -486,7 +486,8 @@ public class ElasticsearchException extends RuntimeException implements ToXConte
                 org.elasticsearch.index.shard.TranslogRecoveryPerformer.BatchOperationException::new, 26),
         SNAPSHOT_CREATION_EXCEPTION(org.elasticsearch.snapshots.SnapshotCreationException.class,
                 org.elasticsearch.snapshots.SnapshotCreationException::new, 27),
-        // 28 was DeleteFailedEngineException
+        DELETE_FAILED_ENGINE_EXCEPTION(org.elasticsearch.index.engine.DeleteFailedEngineException.class,
+                org.elasticsearch.index.engine.DeleteFailedEngineException::new, 28),// deprecated in 6.0, remove in 7.0
         DOCUMENT_MISSING_EXCEPTION(org.elasticsearch.index.engine.DocumentMissingException.class,
                 org.elasticsearch.index.engine.DocumentMissingException::new, 29),
         SNAPSHOT_EXCEPTION(org.elasticsearch.snapshots.SnapshotException.class,
@@ -579,7 +580,8 @@ public class ElasticsearchException extends RuntimeException implements ToXConte
                 org.elasticsearch.action.TimestampParsingException::new, 78),
         ROUTING_MISSING_EXCEPTION(org.elasticsearch.action.RoutingMissingException.class,
                 org.elasticsearch.action.RoutingMissingException::new, 79),
-        // 80 used to be for IndexFailedEngineException, removed in 6.0
+        INDEX_FAILED_ENGINE_EXCEPTION(org.elasticsearch.index.engine.IndexFailedEngineException.class,
+                org.elasticsearch.index.engine.IndexFailedEngineException::new, 80), // deprecated in 6.0, remove in 7.0
         INDEX_SHARD_RESTORE_FAILED_EXCEPTION(org.elasticsearch.index.snapshots.IndexShardRestoreFailedException.class,
                 org.elasticsearch.index.snapshots.IndexShardRestoreFailedException::new, 81),
         REPOSITORY_EXCEPTION(org.elasticsearch.repositories.RepositoryException.class,

core/src/main/java/org/elasticsearch/index/engine/DeleteFailedEngineException.java

@@ -0,0 +1,37 @@
+/*
+ * 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.index.engine;
+
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.index.shard.ShardId;
+
+import java.io.IOException;
+
+/**
+ * Deprecated as not used in 6.0, should be removed in 7.0
+ * Still exists for bwc in serializing/deserializing from
+ * 5.x nodes
+ */
+@Deprecated
+public class DeleteFailedEngineException extends EngineException {
+    public DeleteFailedEngineException(StreamInput in) throws IOException{
+        super(in);
+    }
+}

core/src/main/java/org/elasticsearch/index/engine/IndexFailedEngineException.java

@@ -0,0 +1,61 @@
+/*
+ * 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.index.engine;
+
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.index.shard.ShardId;
+
+import java.io.IOException;
+import java.util.Objects;
+
+/**
+ * Deprecated as not used in 6.0, should be removed in 7.0
+ * Still exists for bwc in serializing/deserializing from
+ * 5.x nodes
+ */
+@Deprecated
+public class IndexFailedEngineException extends EngineException {
+
+    private final String type;
+
+    private final String id;
+
+    public IndexFailedEngineException(StreamInput in) throws IOException{
+        super(in);
+        type = in.readString();
+        id = in.readString();
+    }
+
+    @Override
+    public void writeTo(StreamOutput out) throws IOException {
+        super.writeTo(out);
+        out.writeString(type);
+        out.writeString(id);
+    }
+
+    public String type() {
+        return this.type;
+    }
+
+    public String id() {
+        return this.id;
+    }
+}

core/src/test/java/org/elasticsearch/ExceptionSerializationTests.java

@@ -664,7 +664,7 @@ public class ExceptionSerializationTests extends ESTestCase {
         ids.put(25, org.elasticsearch.script.GeneralScriptException.class);
         ids.put(26, org.elasticsearch.index.shard.TranslogRecoveryPerformer.BatchOperationException.class);
         ids.put(27, org.elasticsearch.snapshots.SnapshotCreationException.class);
-        ids.put(28, null); // was DeleteFailedEngineException
+        ids.put(28, org.elasticsearch.index.engine.DeleteFailedEngineException.class); //deprecated in 6.0
         ids.put(29, org.elasticsearch.index.engine.DocumentMissingException.class);
         ids.put(30, org.elasticsearch.snapshots.SnapshotException.class);
         ids.put(31, org.elasticsearch.indices.InvalidAliasNameException.class);
@@ -716,7 +716,7 @@ public class ExceptionSerializationTests extends ESTestCase {
         ids.put(77, org.elasticsearch.common.util.concurrent.UncategorizedExecutionException.class);
         ids.put(78, org.elasticsearch.action.TimestampParsingException.class);
         ids.put(79, org.elasticsearch.action.RoutingMissingException.class);
-        ids.put(80, null); // was IndexFailedEngineException, removed in 6.0
+        ids.put(80, org.elasticsearch.index.engine.IndexFailedEngineException.class); //deprecated in 6.0
         ids.put(81, org.elasticsearch.index.snapshots.IndexShardRestoreFailedException.class);
         ids.put(82, org.elasticsearch.repositories.RepositoryException.class);
         ids.put(83, org.elasticsearch.transport.ReceiveTimeoutTransportException.class);