Update description.

bt5/erp5_wendelin/PathTemplateItem/portal_callables/DataIngestionLine_writeFluentdIngestionToDataStream.py

 """
-  This script is used during fluentd ingestion.
-  It will write data sent from fluentd by unpacking it first and then appending
-  as a string to respective "Data Stream".
+This script is used during fluentd ingestion. 
+It assumes data comes in msgpack encoded in the following format: mspack(timestamp, data). 
+It will first unpack the msgpack, then remove the first item of the tuple (timestamp) and 
+append str(data) to "Data Stream".
+
+Note that what is saved to Data Stream might be different from what fluentd was reading 
+initially, depending on fluentd plugin configuration. For example fluentd might convert 
+json to msgpack, then what is saved in Data Stream might be str(python_dict) and not json.
 """
 
 out_stream["Data Stream"].appendData(''.join([str(c[1]) for c in context.unpack(data_chunk)]))

bt5/erp5_wendelin/PathTemplateItem/portal_callables/DataIngestionLine_writeIngestionToDataStream.py

 """
-  This script is used during fluentd ingestion.
-  It will append data sent from fluentd to Wendelin 'as it is' to respective "Data Stream".
-  By default data will be encoded in MsgPack format.
+  This script is a general ingestion script which can be used with fluentd or with other http based ingestion tools.
+  It will append data sent to Wendelin 'as it is' to respective "Data Stream".
+
+  Note that by default fluentd data is encoded in msgpack format, this script will not unpack it.
 """
 
 out_stream["Data Stream"].appendData(data_chunk)