Remove UnknownNamedObjectException (#53105)

This was originally thrown from NamedXContentRegistry#parseNamedObject() but
that method now throws a NamedObjectNotFoundException, so this is unused.

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

@@ -1007,8 +1007,7 @@ public class ElasticsearchException extends RuntimeException implements ToXConte
             org.elasticsearch.tasks.TaskCancelledException::new, 146, UNKNOWN_VERSION_ADDED),
         SHARD_LOCK_OBTAIN_FAILED_EXCEPTION(org.elasticsearch.env.ShardLockObtainFailedException.class,
                                            org.elasticsearch.env.ShardLockObtainFailedException::new, 147, UNKNOWN_VERSION_ADDED),
-        UNKNOWN_NAMED_OBJECT_EXCEPTION(org.elasticsearch.common.xcontent.UnknownNamedObjectException.class,
-                org.elasticsearch.common.xcontent.UnknownNamedObjectException::new, 148, UNKNOWN_VERSION_ADDED),
+        // 148 was UnknownNamedObjectException
         TOO_MANY_BUCKETS_EXCEPTION(MultiBucketConsumerService.TooManyBucketsException.class,
             MultiBucketConsumerService.TooManyBucketsException::new, 149, UNKNOWN_VERSION_ADDED),
         COORDINATION_STATE_REJECTED_EXCEPTION(org.elasticsearch.cluster.coordination.CoordinationStateRejectedException.class,

server/src/main/java/org/elasticsearch/common/xcontent/UnknownNamedObjectException.java

@@ -1,74 +0,0 @@
-/*
- * 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.common.xcontent;
-
-import org.elasticsearch.common.ParsingException;
-import org.elasticsearch.common.io.stream.StreamInput;
-import org.elasticsearch.common.io.stream.StreamOutput;
-
-import java.io.IOException;
-
-import static java.util.Objects.requireNonNull;
-
-/**
- * Thrown when {@link NamedXContentRegistry#parseNamedObject(Class, String, XContentParser, Object)} is called with an unregistered
- * name. When this bubbles up to the rest layer it is converted into a response with {@code 400 BAD REQUEST} status.
- */
-public class UnknownNamedObjectException extends ParsingException {
-    private final String categoryClass;
-    private final String name;
-
-    public UnknownNamedObjectException(XContentLocation contentLocation, Class<?> categoryClass, String name) {
-        super(contentLocation, "Unknown " + categoryClass.getSimpleName() + " [" + name + "]");
-        this.categoryClass = requireNonNull(categoryClass, "categoryClass is required").getName();
-        this.name = requireNonNull(name, "name is required");
-    }
-
-    /**
-     * Read from a stream.
-     */
-    public UnknownNamedObjectException(StreamInput in) throws IOException {
-        super(in);
-        categoryClass = in.readString();
-        name = in.readString();
-    }
-
-    @Override
-    public void writeTo(StreamOutput out) throws IOException {
-        super.writeTo(out);
-        out.writeString(categoryClass);
-        out.writeString(name);
-    }
-
-    /**
-     * Category class that was missing a parser. This is a String instead of a class because the class might not be on the classpath
-     * of all nodes or it might be exclusive to a plugin or something.
-     */
-    public String getCategoryClass() {
-        return categoryClass;
-    }
-
-    /**
-     * Name of the missing parser.
-     */
-    public String getName() {
-        return name;
-    }
-}

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

@@ -55,7 +55,6 @@ import org.elasticsearch.common.transport.TransportAddress;
 import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.common.util.CancellableThreadsTests;
 import org.elasticsearch.common.util.set.Sets;
-import org.elasticsearch.common.xcontent.UnknownNamedObjectException;
 import org.elasticsearch.common.xcontent.XContentLocation;
 import org.elasticsearch.env.ShardLockObtainFailedException;
 import org.elasticsearch.index.Index;
@@ -808,7 +807,7 @@ public class ExceptionSerializationTests extends ESTestCase {
         ids.put(145, org.elasticsearch.ElasticsearchStatusException.class);
         ids.put(146, org.elasticsearch.tasks.TaskCancelledException.class);
         ids.put(147, org.elasticsearch.env.ShardLockObtainFailedException.class);
-        ids.put(148, UnknownNamedObjectException.class);
+        ids.put(148, null);
         ids.put(149, MultiBucketConsumerService.TooManyBucketsException.class);
         ids.put(150, CoordinationStateRejectedException.class);
         ids.put(151, SnapshotInProgressException.class);

server/src/test/java/org/elasticsearch/common/xcontent/UnknownNamedObjectExceptionTests.java

@@ -1,55 +0,0 @@
-/*
- * 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.common.xcontent;
-
-import org.elasticsearch.common.io.stream.BytesStreamOutput;
-import org.elasticsearch.common.io.stream.StreamInput;
-import org.elasticsearch.rest.RestStatus;
-import org.elasticsearch.test.ESTestCase;
-
-import java.io.IOException;
-
-public class UnknownNamedObjectExceptionTests extends ESTestCase {
-    public void testRoundTrip() throws IOException {
-        XContentLocation location = new XContentLocation(between(1, 1000), between(1, 1000));
-        UnknownNamedObjectException created = new UnknownNamedObjectException(location, UnknownNamedObjectExceptionTests.class,
-                randomAlphaOfLength(5));
-        UnknownNamedObjectException roundTripped;
-
-        try (BytesStreamOutput out = new BytesStreamOutput()) {
-            created.writeTo(out);
-            try (StreamInput in = out.bytes().streamInput()) {
-                roundTripped = new UnknownNamedObjectException(in);
-            }
-        }
-        assertEquals(created.getMessage(), roundTripped.getMessage());
-        assertEquals(created.getLineNumber(), roundTripped.getLineNumber());
-        assertEquals(created.getColumnNumber(), roundTripped.getColumnNumber());
-        assertEquals(created.getCategoryClass(), roundTripped.getCategoryClass());
-        assertEquals(created.getName(), roundTripped.getName());
-    }
-
-    public void testStatusCode() {
-        XContentLocation location = new XContentLocation(between(1, 1000), between(1, 1000));
-        UnknownNamedObjectException e = new UnknownNamedObjectException(location, UnknownNamedObjectExceptionTests.class,
-                randomAlphaOfLength(5));
-        assertEquals(RestStatus.BAD_REQUEST, e.status());
-    }
-}