DOCSP-30376: Clarified streaming produces a single partition (#161)

* DOCSP-30376: Clarified streaming produces a single partition

* Empty build commit

* PR feedback

Author: DBirtolo-mdb

source/configuration/read.txt

@@ -133,6 +133,10 @@ You can configure the following properties to read from MongoDB:
 Partitioner Configurations
 ~~~~~~~~~~~~~~~~~~~~~~~~~~
 
+Partitioners change the read behavior for batch reads with the {+driver-short+}.
+They do not affect Structured Streaming because the data stream processing
+engine produces a single stream with Structured Streaming.
+
 This section contains configuration information for the following 
 partitioners:
 

source/structured-streaming.txt

@@ -200,6 +200,13 @@ more about continuous processing, see the `Spark documentation <https://spark.ap
 
 .. include:: /includes/fact-read-from-change-stream
 
+.. note::
+
+    Since Structured Streaming produces a single partition, it ignores
+    :ref:`partitioner configurations <partitioner-conf>`. Partitioner
+    configuration only apply when there are multiple partitions. This is true
+    for both micro-batch processing and continuous processing streams.
+
 .. tabs-drivers::
 
    tabs: