Partial Updates for EnumFields in Solr 8.8.1

[Daniel Exner]

Hi everyone,

we have some Issue after Upgrading from Solr 8.2.0 to 8.8.1.
This might as well be an Lucene Issue, but I'm not sure.

The solr schema includes some fields using EnumFieldType like e.g.

<fieldType name="languages" class="solr.EnumFieldType" docValues="true" 
enumsConfig="enumsConfig.xml" enumName="language"/>

with enumConfig.xml loooking like this:

<?xml version="1.0" ?>
<enumsConfig>
  <enum name="language">
    <value>de</value>
    <value>fr</value>
  </enum>
</enumsConfig>

There is no error or Warning about this somewhere in Error log.

Greetings
Daniel Exner

When updating some different field, like say "stock" for a document using partial Update, *all* enum Fields with stored=false vanish from the document.

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