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https://issues.apache.org/jira/browse/SOLR-15540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17390025#comment-17390025
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Chris M. Hostetter commented on SOLR-15540:
-------------------------------------------
FWIW...
{quote}Add some fields in Solr8 ...
{quote}
If you want to add & use the "nest_path" fields to your schema, then you *MUST*
re-index (even if this bug didn't exist) to populate those fields for all your
nested documents
> Duplicated adding document for update when Solr7 upgrade to Solr8
> -----------------------------------------------------------------
>
> Key: SOLR-15540
> URL: https://issues.apache.org/jira/browse/SOLR-15540
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: update, UpdateRequestProcessors
> Affects Versions: 8.8.2
> Environment: SolrCloud Solr 8.8.2
> Reporter: samuel ma
> Priority: Major
>
> We upgrade Solr7.7.2 to Solr8.8.2, keep using the Solr 7 index data, the
> query operation is fine. But when we try to add the doc (with the same doc
> id, actually is an update operation) to Solr8, we actually see 2 doc with the
> same id, which means the update did not remove the Solr7 doc.
> Below is the schema.xml configuration for Solr7.
> {code:java}
> <field name="id" type="string" indexed="true" stored="true" required="true"
> multiValued="false" />
> <uniqueKey>id</uniqueKey>
> <field name="_root_" type="string" indexed="true" stored="false"/>
> {code}
>
> Add some fields in Solr8
> <field name="_nest_path_" type="_nest_path_" stored="true"/>
> <fieldType name="_nest_path_" class="solr.NestPathField" />
>
> I can see in Sol7 code
> {code:java}
> DirectUpdateHandler2.updateDocOrDocValues{code}
> use the idTerm as updateTerm, but in this case Solr8 use rootTerm as the
> updateTerm. is this an expected behavior? how do we handle this incompatible
> issue?
>
> Add comment:
> This also impacts deletebyId
>
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