1) Which props/trasnforms files you alter may depend on your other configurations. You can use btool to ensure the configurations you create are being handled as you want them.
2) That depends on what sourcetype the data is created with. When you search for this data in your Splunk instance, what do you see for the sourcetype?
3) You should not need to re-index, but you should at least perform a debug/refresh (yoursplunkhost:8000/debug/refresh, and click the button that is shown there) to inform Splunk to re-read its configuration.
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