Based on the documentation:
The script must be located in one of two places:
$SPLUNK_HOME/etc/searchscripts
$SPLUNK_HOME/etc/apps/<app_name>/bin
See "More about the external lookup script" for more information about how such scripts work.
When I have the script within the apps/<app_name>/bin directory it is never picked up. When I move it to the searchscripts directory it runs just fine. Is the ability to have external lookup scripts within an app not possible? (Splunk 6.3)
Here is my transforms.conf:
[testLookup]
external_cmd=test_lookup.py testField1 testField2
external_type=python
fields_list=testField1, testField2
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