Per the solr 9.7 release notes, docValues are now enabled by default for a 
variety of fieldTypes. There is a warning that any index that is not already 
using docValues cannot be converted to docValues by Lucene standard. I want to 
be absolutely sure that my understanding of what this means is clear before 
potentially corrupting the index of my cloud. If I am understanding this change 
correctly, the ONLY situation which would require a re-index is if I have a 
field & fieldType combination that uses one of the aforementioned solr 
primitive fieldTypes and does not have docValues set correct?

Some cases:
* docValue is set (true or false) for a field means this field is ok
* docValue is not set for a field, but is set for its fieldType means this 
field is ok (as it inherits docValue behavior from fieldType?)
* dynamic fields that fall into one of the previous two cases are ok

Can someone, or multiple people, help confirm this understanding? Thanks

-Kevin

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