KAFKA-3435: Remove Unstable annotation from new Java Consumer

Author: Grant Henke <granthenke@gmail.com>

Reviewers: Gwen Shapira

Closes apache#1113 from granthenke/remove-unstable

clients/src/main/java/org/apache/kafka/clients/consumer/Consumer.java

@@ -3,9 +3,9 @@
  * file distributed with this work for additional information regarding copyright ownership. The ASF 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.
@@ -29,7 +29,6 @@
  * @see KafkaConsumer
  * @see MockConsumer
  */
-@InterfaceStability.Unstable
 public interface Consumer<K, V> extends Closeable {
 
     /**

clients/src/main/java/org/apache/kafka/clients/consumer/KafkaConsumer.java

@@ -165,11 +165,11 @@
  * In this example the client is subscribing to the topics <i>foo</i> and <i>bar</i> as part of a group of consumers
  * called <i>test</i> as described above.
  * <p>
- * The broker will automatically detect failed processes in the <i>test</i> group by using a heartbeat mechanism. The 
- * consumer will automatically ping the cluster periodically, which lets the cluster know that it is alive. Note that 
- * the consumer is single-threaded, so periodic heartbeats can only be sent when {@link #poll(long)} is called. As long as 
- * the consumer is able to do this it is considered alive and retains the right to consume from the partitions assigned 
- * to it. If it stops heartbeating by failing to call {@link #poll(long)} for a period of time longer than <code>session.timeout.ms</code> 
+ * The broker will automatically detect failed processes in the <i>test</i> group by using a heartbeat mechanism. The
+ * consumer will automatically ping the cluster periodically, which lets the cluster know that it is alive. Note that
+ * the consumer is single-threaded, so periodic heartbeats can only be sent when {@link #poll(long)} is called. As long as
+ * the consumer is able to do this it is considered alive and retains the right to consume from the partitions assigned
+ * to it. If it stops heartbeating by failing to call {@link #poll(long)} for a period of time longer than <code>session.timeout.ms</code>
  * then it will be considered dead and its partitions will be assigned to another process.
  * <p>
  * The deserializer settings specify how to turn bytes into objects. For example, by specifying string deserializers, we
@@ -452,7 +452,6 @@
  * commit.
  *
  */
-@InterfaceStability.Unstable
 public class KafkaConsumer<K, V> implements Consumer<K, V> {
 
     private static final Logger log = LoggerFactory.getLogger(KafkaConsumer.class);