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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:
--------------------------------------

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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