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https://issues.apache.org/jira/browse/SOLR-13961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16980520#comment-16980520
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Thomas Wöckinger commented on SOLR-13961:
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To have a consistent API unsetting nested documents should work the same as
unsetting regular fields. For regular fields this is possible and also
documented.
>From
>https://lucene.apache.org/solr/guide/8_3/updating-parts-of-documents.html#atomic-updates
{{set}}
Set or replace the field value(s) with the specified value(s), or remove the
values if 'null' or empty list is specified as the new value.
May be specified as a single value, or as a list for multiValued fields.
> Unsetting Nested Documents using Atomic Update leads to SolrException:
> undefined field
> --------------------------------------------------------------------------------------
>
> Key: SOLR-13961
> URL: https://issues.apache.org/jira/browse/SOLR-13961
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Tests, UpdateRequestProcessors
> Affects Versions: master (9.0), 8.3, 8.4
> Reporter: Thomas Wöckinger
> Priority: Critical
> Labels: easyfix
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Using null or empty collection to unset nested documents (as suggested by
> documentation) leads to SolrException: undefined field ... .
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