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https://issues.apache.org/jira/browse/SOLR-12002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16365730#comment-16365730
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Marius Ghita commented on SOLR-12002:
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That's not exactly what I've reported. Maybe I phrased myself poorly. The
schema was changed and during indexing Solr showed many warnings of the message
I've quoted, and those messages still showed up during indexing no matter how
many times I reloaded the core; and only once I've restarted Solr they stopped
showing up during indexing.
> Allow DocValue type changes without reindex
> -------------------------------------------
>
> Key: SOLR-12002
> URL: https://issues.apache.org/jira/browse/SOLR-12002
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 6.6.2
> Reporter: Marius Ghita
> Priority: Major
>
> I've made a change to our Solr schema where an existing field was changed and
> docValues="true" was added. Only doing a core reload, during reindexing (with
> the clean flag, in dataimporter) the message "Cannot change DocValues type
> from SORTED_SET to SORTED for field companyType" showed up in the logs, but
> not for all documents.
> Issuing a Solr restart and then reindexing fixed the issue. Under the
> assumption that core reload should handle any schema changes without issue, I
> think that this behaviour can be considered a bug.
> Note that I'm using the classical schema configuration (disabled managed
> schema), maybe managed schema exhibits the same behaviour but that's untested
> on my end.
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