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https://issues.apache.org/jira/browse/SOLR-8725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15169572#comment-15169572
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Jeff Wartes commented on SOLR-8725:
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Well, I'm glad I haven't tried moving to 5.5 yet, this would have been an
unpleasant migration discovery.
I use hyphens in both collection names and alias names. (although not as a
leading character)
Generally, I prefer to avoid using underscores anyplace that ends up in a URL.
> Invalid name error with core names with hyphens
> -----------------------------------------------
>
> Key: SOLR-8725
> URL: https://issues.apache.org/jira/browse/SOLR-8725
> Project: Solr
> Issue Type: Bug
> Affects Versions: 5.5
> Reporter: Chris Beer
>
> In SOLR-8642, hyphens are no longer considered valid identifiers for cores
> (and collections?). Our solr instance was successfully using hyphens in our
> core names, and our affected cores now error with:
> marc-profiler_shard1_replica1:
> org.apache.solr.common.SolrException:org.apache.solr.common.SolrException:
> Invalid name: 'marc-profiler_shard1_replica1' Identifiers must consist
> entirely of periods, underscores and alphanumerics
> Before starting to rename all of our collections, I wonder if this decision
> could be revisited to be backwards compatible with previously created
> collections.
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