The inputs.conf file on the Splunk forwarder has to be pointing to whatever index you are sending the data. And then after you change the inputs.conf file on the Splunk forwarder, you have to restart the forwarder. Did you do those things after changing the index?
(Also, the entries in eventtypes.conf are dependent on the index name, so that might be causing issues as well. You'll probably want to modify that file on the Splunk server to reflect the actual index name.)
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