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https://issues.apache.org/jira/browse/SOLR-8396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15212276#comment-15212276
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Yonik Seeley commented on SOLR-8396:
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bq. If we release 6.0.0 without some form of the patch for this issue, users 
who install 6.0.0 and don't change their configs will be unable to upgrade to 
7.x

For users upgrading from versions < 6.0, there will be issues regardless.  I 
don't believe there is any code anywhere than upgrades numeric types in an 
index.  So even if we get PointField in for 6.0, a person upgrading from 5.5 
will have the old numeric stuff in their index, which would cease working 
if/when that old numeric stuff is removed.  The simple answer is: we need to 
keep the old numeric stuff around longer regardless of when we have support for 
the newer Point stuff.

> Investigate PointField to replace NumericField types
> ----------------------------------------------------
>
>                 Key: SOLR-8396
>                 URL: https://issues.apache.org/jira/browse/SOLR-8396
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Ishan Chattopadhyaya
>         Attachments: SOLR-8396.patch, SOLR-8396.patch
>
>
> In LUCENE-6917, [~mikemccand] mentioned that DimensionalValues are better 
> than NumericFields in most respects. We should explore the benefits of using 
> it in Solr and hence, if appropriate, switch over to using them.



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