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https://issues.apache.org/jira/browse/SOLR-10829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16040483#comment-16040483
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Alan Woodward commented on SOLR-10829:
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Do you think it's worth creating a specific IDField class for this? That way
we can enforce ID requirements (keyword analyzed, doc values for sorting, no
point values) for the unique key field, and for _root_ and _parent_ and other
special fields. The schema for 7.0 detects if any of these fields aren't using
the IDField type and emits a warning, and 8.0 errors out.
> IndexSchema should enforce that uniqueKey field must not be points based
> ------------------------------------------------------------------------
>
> Key: SOLR-10829
> URL: https://issues.apache.org/jira/browse/SOLR-10829
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Hoss Man
>
> if a uniqueKey field is defined, then the IndexSchema should fail fast & hard
> on startup if the field type of the specific uniqueKey uses "points" (ie:
> {{FieldType.isPointField()}})
> The reason for this is because deleting by id, and overwriting existing
> documents are predicated on being able to use
> {{IndexWriter.deleteDocuments(Term...)}} and
> {{IndexWriter.updateDocument(Term, Iterable<..docs..>)}} respectively -- but
> Points based fields have no "Term" that can be based to these methods.
> IndexSchema.readSchema should fail fast in this case with a clear error (just
> like it does if the uniqueKey field is multivalued)
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