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https://issues.apache.org/jira/browse/SOLR-13980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986691#comment-16986691
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Shawn Heisey commented on SOLR-13980:
-------------------------------------

I have never actually used the parent/child document support, so consider that 
when reading below:

It's my understanding that all documents in a parent/child relationship must 
reside in the same Lucene index segment.  If I'm reading your schema correctly, 
the color_s field is not eligible for in-place updates.  Which means that when 
you do that update, the original document is marked as deleted and a new one is 
indexed into another segment – which means that the same-segment requirement 
has not been met.  I think that's the root of the problem here.

Only barely related:  Jira is not a support portal for the Solr project.  When 
you created this issue, there was a prominent note in red text explaining this.

> Solr Parent or Child Document Update Issue
> ------------------------------------------
>
>                 Key: SOLR-13980
>                 URL: https://issues.apache.org/jira/browse/SOLR-13980
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>         Environment: [^solrconfig.xml]
> [^managed-schema.xml]
>  [^ParentChildQueryOutput.txt]
> [^SelectAllQuery.txt]
>            Reporter: Pavan
>            Priority: Major
>         Attachments: ParentChildQueryOutput.txt, Screenshot 2019-11-25 at 
> 4.24.36 PM.png, Screenshot 2019-11-25 at 4.26.12 PM.png, Screenshot 
> 2019-11-25 at 4.30.38 PM.png, Screenshot 2019-11-25 at 4.48.54 PM.png, 
> SelectAllQuery.txt, managed-schema.xml, solrconfig.xml
>
>
> Hi Team,
> We are trying to update only child or parent document in solr 8.3 version  as 
> per the example mentioned in 
> document:[https://lucene.apache.org/solr/guide/8_3/updating-parts-of-documents.html]
>  , but the issue we facing is child or parent document alone not getting 
> updated.
> When we query using parent child query not retuning updated value , but when 
> we query using q=*:* in debug mode enabled , document count got increased by 
> 1 .i.e. 3 to 4 but its not replace right child doc.
> Can you please let us know is there any other configuration need to be added 
> to support feature  (or) child or parent document only update feature not 
> supported currently ?
> *+Configuration:+*
> Running locally in SolrCloud mode with 4 Shards and 2 Replication factor , 
> using external zookeeper.
> Attached solr-config.xml , managed-schema.xml , parent child query output in 
> ParentChildQueryOutput.txt file  and Query all output in SelectAllQuery.txt 
> file.
> Same example we executed as per document .
> *+Index Operation:+*
> {code}
> {
>   "id": "mydoc",
>   "path_s": "1.mydoc",
>   "parent_id_s": "mydoc",
>   "product_s": "T-Shirt",
>   "stock": [
>     { "path_s": "2.mydoc-mydoc2",       "id": "mydoc2",       "parent_id_s": 
> "mydoc2",       "color_s": "red",       "size_ss": ["L"]     },
>     { "path_s": "2.mydoc-mydoc3",       "id": "mydoc3",       "parent_id_s": 
> "mydoc3",       "color_s": "blue",       "size_ss": ["M" ]     }
>   ]
> }
> {code}
> *+Update Operation:+*
> {code}
> curl -X POST -H 'Content-Type: application/json' 
> '[http://localhost:8983/solr/parentchild/update/json/docs?_route_=mydoc]' 
> --data-binary '{  "id":"mydoc2",   "color_s":{"set":"test"}}'
> {code}
> _edit_: remove extra spacing to make it easier to read



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