DOCSP-47144-timeseries-limitations (#197)

* add timeseries info

* fix role

* wording

* wording

* style

Author: shuangela

source/mongoimport/mongoimport-behavior.txt

@@ -85,6 +85,13 @@ Batches
 ``mongoimport`` uses a maximum batch size of 100,000 to
 perform bulk insert/upsert operations.
 
+Time Series Collections
+~~~~~~~~~~~~~~~~~~~~~~~
+
+To import time series data, you must create a :ref:`time series collection <manual-timeseries-landing>`
+before running ``mongoimport``. ``mongoimport`` does not support creating time series collections
+automatically. For more information about creating a collection, see :method:`~db.createCollection()`.
+
 Required Access
 ---------------