[hotfix][docs] Soft-deprecating Streaming File Sink

docs/content/docs/connectors/datastream/overview.md

@@ -42,7 +42,6 @@ Connectors provide code for interfacing with various third-party systems. Curren
  * [Apache Cassandra]({{< ref "docs/connectors/datastream/cassandra" >}}) (sink)
  * [Amazon Kinesis Streams]({{< ref "docs/connectors/datastream/kinesis" >}}) (source/sink)
  * [Elasticsearch]({{< ref "docs/connectors/datastream/elasticsearch" >}}) (sink)
- * [FileSystem (Hadoop included) - Streaming only]({{< ref "docs/connectors/datastream/streamfile_sink" >}}) (sink)
  * [FileSystem (Hadoop included) - Streaming and Batch]({{< ref "docs/connectors/datastream/file_sink" >}}) (sink)
  * [RabbitMQ]({{< ref "docs/connectors/datastream/rabbitmq" >}}) (source/sink)
  * [Apache NiFi]({{< ref "docs/connectors/datastream/nifi" >}}) (source/sink)

docs/content/docs/connectors/datastream/streamfile_sink.md

@@ -4,6 +4,7 @@ weight: 6
 type: docs
 aliases:
   - /dev/connectors/streamfile_sink.html
+bookHidden: true
 ---
 <!--
 Licensed to the Apache Software Foundation (ASF) under one
@@ -29,6 +30,10 @@ under the License.
 This connector provides a Sink that writes partitioned files to filesystems
 supported by the [Flink `FileSystem` abstraction]({{< ref "docs/deployment/filesystems/overview" >}}).
 
+{{< hint warning >}}
+This Streaming File Sink is in the process of being phased out. Please use the unified [File Sink]({{< ref "docs/connectors/datastream/file_sink" >}}) as a drop-in replacement.
+{{< /hint >}}
+
 The streaming file sink writes incoming data into buckets. Given that the incoming streams can be unbounded,
 data in each bucket are organized into part files of finite size. The bucketing behaviour is fully configurable
 with a default time-based bucketing where we start writing a new bucket every hour. This means that each resulting