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https://issues.apache.org/jira/browse/SOLR-15018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17240483#comment-17240483
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David Smiley commented on SOLR-15018:
-------------------------------------
FWIW, I don't recommend a "*" ignored catch-all dynamic field except maybe in
some early prototyping scenario as a sort of TODO before you lock down the
schema.
> Atomic update deletes child documents if schema has catch-all ignore field
> --------------------------------------------------------------------------
>
> Key: SOLR-15018
> URL: https://issues.apache.org/jira/browse/SOLR-15018
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: update
> Affects Versions: 8.6.3
> Reporter: Andreas Hubold
> Priority: Major
> Labels: AtomicUpdate, ChildDocuments, NestedDocuments
>
> Nested child documents disappear when some unrelated fields of a parent
> document are atomically updated, if the schema contains a catch-all dynamic
> field to ignore unknown fields like:
> {noformat}
> <dynamicField name="*" type="ignored" />
> <fieldType name="ignored" stored="false" indexed="false" multiValued="true"
> class="solr.StrField" /> {noformat}
> {{DistributedUpdateProcessor#getUpdatedDocument}} tries to reconstruct the
> original document, but it does not receive nested documents from
> {{RealTimeComponent#getInputDocument}}. Nested documents are correctly found
> in the index but get lost when {{RealTimeGetComponent#toSolrInputDocument}}
> creates a SolrInputDocument for it. The problematic code is:
> {code:java}
> SchemaField sf = schema.getFieldOrNull(fname);
> if (sf != null) {
> if ((!sf.hasDocValues() && !sf.stored()) || schema.isCopyFieldTarget(sf))
> continue;
> } {code}
> The code finds the "ignored" SchemaField as matching field for the nested
> document name (loaded from _nest_path_). Because of that they're not added to
> the SolrInputDocument.
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