I found another user with a similar problem:
http://dspace.2283337.n4.nabble.com/ERROR-creating-index-discovery-td4676204.html

I found this recommendation very good:
"Always start with the default configuration from the new version and put
your changes in there, not the other way around."

See if there is something in that thread that is helpful.

-Jose

On Wed, Dec 2, 2020 at 1:37 PM Luiz Ricardo Rech <[email protected]> wrote:

> Hello guys.
>
> We are conducting tests to verify the possibility of migrating our data
> from version 4.2 of DSpace to version 6.3.
>
> We set up a virtual server for this and performed a clean installation in
> order to start testing. The installation went smoothly. However, after
> importing the database, copying the folders (assetstore and solr /
> statistics) and performing the database migration, when we perform
> index-discovery, indexing does not occur, except for communities. These are
> displayed normally, but deposits on them are not. The search also does not
> display any results. New deposits on this basis also work without problems.
> Only content imported into the bank is not indexed.
>
> Checking the DSpace log, we find what appears to be the problem:
>
> ERROR org.dspace.discovery.SolrServiceImpl @ No choices plugin was
> configured for field "dc_subject_cnpq".
>
> This is a specific field of a customization made on a DSpace fork.
> However, would you know if there is a way to ignore or work around this
> situation? Has anyone experienced this similar situation or would you have
> any idea how to fix it?
>
> This occurs in all deposits. We have tried to use routine modifiers, such
> as index-discovery -f and even index-discovery -b, without success.
>
> Universidade Estadual do Centro-Oeste - Unicentro
> http://www.unicentro.br
>
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