At Esri supports' recommendation, I'm following the instructions @ How To: Rebuild the index for Portal for ArcGIS 10.6.1 for rebuilding the index for Portal. In C:\arcgisportal\index\nodes\0\indices, there are 4 long folder names, which the technical support article says to delete the contents of and replace with extracted items from the empty-index.zip file, based on a text string in each of the .st files in each of those folders.
However, there are only three folders in the empty-index.zip file, corresponding to ago-items, ago-groups, and ago-users. However, there are FOUR long folder names in my indices directory. Each of three from the indices dir corresponds to the ago-items, ago-groups, ago-users folder, but the fourth is an outlier. Looking at the .st file, there is a text string that says dsconfig-es5 where the other three have either ago-items, ago-groups, ago-users. My question is what to do with that long folder name. Still delete the contents? Do I put anything in the folder after deleting, or just keep it deleted and rebuild the index from the portaladmin page once all the work is done?