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https://issues.apache.org/jira/browse/SOLR-12887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16665423#comment-16665423
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David Smiley commented on SOLR-12887:
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An unstated assumption is that IDs should be globally unique -- just as it is
if you were to use a single typical collection and likewise if you were to use
an alias across multiple collections "normally". Furthermore we don't expect
you will update the timestamp field. Again, that's consistent with
router.field on a standard collection.
> TRA: document re-dating (question, test, docs)
> ----------------------------------------------
>
> Key: SOLR-12887
> URL: https://issues.apache.org/jira/browse/SOLR-12887
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Christine Poerschke
> Priority: Minor
> Attachments: SOLR-12887.patch
>
>
> This ticket is sort of a combination of a question with small test and
> documentation additions.
> After a document is added, can subsequent updates to it include a change of
> its timestamp? What happens if a timestamp change logically 'moves' the
> document out of its original collection?
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