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Add example on how to search for a MAC address

JIRA INFRA-932

docs/network.rst

@@ -61,6 +61,10 @@ As for the inventory :ref:`inventory-search`, Elasticsearch is used as the full-
 
 .. image:: _static/network/search_host_name_field.png
 
+- To search for a MAC address, you need to use double quotes due to the ``:`` reserved character:  ``"0a:22:b9:dd:19:1d"``.
+
+.. image:: _static/network/search_host_mac.png
+
 The complete list of fields that can be searched is the following:
 
   - created_at