What is correct way to set-up Stream Forwarders with an Index Cluster?

[transtrophe]

In the process of trying to get Splunk App for Stream up and running in a distributed deployment using an index cluster with 8 indexers set with repFactor = 5 and a single Stream App search-head. I have TA-stream installed on 4 forwarders. I have enabled Data Inputs > Wire Data on all 4 of these forwarders including setting the Splunk App for Stream location to the single Stream App search head (not using SSL so this is set to port 8000 using http://).

The inputs.conf file is configured on all 4 forwarders with the following settings in the [streamfwd] and [streamfwd://streamfwd] stanzas:

/opt/splunk/etc/apps/Splunk_TA_stream/default/inputs.conf [streamfwd]
/opt/splunk/etc/system/default/inputs.conf _rcvbuf = 1572864
/opt/splunk/etc/apps/Splunk_TA_stream/default/inputs.conf disabled = true
/opt/splunk/etc/system/local/inputs.conf host = ip-172-31-21-115
/opt/splunk/etc/system/default/inputs.conf index = default
/opt/splunk/etc/apps/Splunk_TA_stream/default/inputs.conf source = stream
/opt/splunk/etc/apps/Splunk_TA_stream/local/inputs.conf [streamfwd://streamfwd]
/opt/splunk/etc/system/default/inputs.conf _rcvbuf = 1572864
/opt/splunk/etc/apps/Splunk_TA_stream/local/inputs.conf disabled = 0
/opt/splunk/etc/system/local/inputs.conf host = ip-172-31-21-115
/opt/splunk/etc/system/default/inputs.conf index = default
/opt/splunk/etc/apps/Splunk_TA_stream/default/inputs.conf source = stream
/opt/splunk/etc/apps/Splunk_TA_stream/local/inputs.conf splunk_stream_app_location = http://ip-172-31-30-208:8000/en-us/custom/splunk_app_stream/

When I try to do a search of source=stream* from the search-head I get no results. What am I missing in getting this set-up? I do see the index is pointing to default - not sure if I should be pointing to a different index. When I look at indexes on the index cluster master DMC I don't see any events in the main index.