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Legacy Admin Console - View the SNMP Repository Dump to find out what search feeds are defined:
Open the dump via the legacy Admin Console:
http://{host_or_ip}:90/snmp_dump
Click Feed_Table and look at the row for feedDefinition.
If you have more than one feed (column), the primary (default) feed is the one that does not have 'respondsToLists': False:
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For the primary feed, note the value for 'IndexAlias' and enter this in the NFS export definition.
curl - Query to find out what search feeds are defined:
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