Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/6391#discussion_r204990734
--- Diff:
flink-connectors/flink-connector-elasticsearch6/src/main/java/org/apache/flink/streaming/connectors/elasticsearch6/ElasticsearchSink.java
---
@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE 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.
+ */
+
+package org.apache.flink.streaming.connectors.elasticsearch6;
+
+import
org.apache.flink.streaming.connectors.elasticsearch.ActionRequestFailureHandler;
+import
org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkBase;
+import
org.apache.flink.streaming.connectors.elasticsearch.ElasticsearchSinkFunction;
+import
org.apache.flink.streaming.connectors.elasticsearch.util.NoOpFailureHandler;
+
+import org.apache.http.HttpHost;
+import org.elasticsearch.action.ActionRequest;
+import org.elasticsearch.action.DocWriteRequest;
+import org.elasticsearch.action.bulk.BulkProcessor;
+import org.elasticsearch.client.RestHighLevelClient;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Elasticsearch 6.x sink that requests multiple {@link ActionRequest
ActionRequests}
+ * against a cluster for each incoming element.
+ *
+ * <p>The sink internally uses a {@link RestHighLevelClient} to
communicate with an Elasticsearch cluster.
+ * The sink will fail if no cluster can be connected to using the provided
transport addresses passed to the constructor.
+ *
+ * <p>The {@link Map} passed to the constructor is used to create the
{@code TransportClient}. The config keys can be found
+ * in the <a href="https://www.elastic.io";>Elasticsearch
documentation</a>. An important setting is {@code cluster.name},
+ * which should be set to the name of the cluster that the sink should
emit to.
+ *
+ * <p>Internally, the sink will use a {@link BulkProcessor} to send {@link
ActionRequest ActionRequests}.
+ * This will buffer elements before sending a request to the cluster. The
behaviour of the
+ * {@code BulkProcessor} can be configured using these config keys:
+ * <ul>
+ * <li> {@code bulk.flush.max.actions}: Maximum amount of elements to
buffer
+ * <li> {@code bulk.flush.max.size.mb}: Maximum amount of data (in
megabytes) to buffer
+ * <li> {@code bulk.flush.interval.ms}: Interval at which to flush data
regardless of the other two
+ * settings in milliseconds
+ * </ul>
+ *
+ * <p>You also have to provide an {@link ElasticsearchSinkFunction}. This
is used to create multiple
+ * {@link ActionRequest ActionRequests} for each incoming element. See the
class level documentation of
+ * {@link ElasticsearchSinkFunction} for an example.
+ *
+ * @param <T> Type of the elements handled by this sink
+ */
+public class ElasticsearchSink<T> extends ElasticsearchSinkBase<T> {
--- End diff --
Add `@PublicEvolving`
---
