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https://issues.apache.org/jira/browse/SOLR-15018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17238818#comment-17238818
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Andreas Hubold commented on SOLR-15018:
---------------------------------------
Also mentioned on the solr-user mailing list:
[https://mail-archives.apache.org/mod_mbox/lucene-solr-user/202011.mbox/%3Cad098efe-c895-bf5d-078d-f214731f841d%40coremedia.com%3E]
A possible workaround is to remove the catch-all "ignored" field, and replace
it with a custom UpdateRequestProcessor that removes unknown fields (except
those that are used for nested documents).
I'm not sure, but another possible workaround might be to add an unused schema
field (stored="true") with the name of the nested document. I didn't test that
because it would be quite confusing, as also said in the reference guide
[https://lucene.apache.org/solr/guide/8_6/indexing-nested-documents.html#schema-configuration]
{quote}Even though child documents are provided as field values syntactically
and with SolrJ, it’s a matter of syntax and it isn’t an actual field in the
schema. Consequently, the field need not be defined in the schema and probably
shouldn’t be as it would be confusing. There is no child document field type,
at least not yet.
{quote}
> 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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