Disclaimer:  My background is Windows desktop and AD management and PowerShell. 
 I have no experience with Solr and only very limited experience with Java, so 
please be patient with me.  

I have inherited a Solr 7.2.1 setup (on Windows), and I'm trying to figure it 
out so that it can be migrated to a newer system and to Solr 8.5.2.  I feel 
like the documentation assumes an awful lot of prior knowledge that I'm clearly 
lacking and especially in how to upgrade versions of Solr.  As a "Windows guy" 
I'm used to binaries and configuration files in separate locations and 
upgrading is generally and easy replacement of the binaries and (sometimes 
automated) adjustments to the config.  With Solr, it's all jumbled into the 
same folder structure, and I am trying to track down where all the important 
info is set.

The old setup appears to be a stand-alone system with 5 cores (some of which 
may be test/experiments) and what I believe are pretty small indexes and not 
using any configsets (although there are a few in there).  I compared the 
"Solr.in.cmd" files from the old to the default, new and adjusted as seemed 
fitting.  I was able to successfully start an empty Solr 8.5.2 and view the 
admin interface.

Then, I stopped the service on the old server (it's not a critical system) and 
copied the folders for the cores over to the new system.  When I start it up, 
one of the cores is running and I get errors on the other four.  Two each of:

    Plugin init failure for [schema.xml] fieldType "textSuggest"   
    Plugin init failure for [schema.xml] fieldType "textSpell"

I'm not having any luck finding information on how to resolve this.  Am I 
missing a plugin java library?  Where might I get it and/or load it?  Is there 
some config file I missed from some other location?

I appreciate any suggestions you can offer.

Erich

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