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https://issues.apache.org/jira/browse/SOLR-308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12513947
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Thomas Peuss commented on SOLR-308:
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That would be a good replacement for my problem. From the Lucene docs I see 
that the document id is 32 bits (int). I don't know if the docid "wraps around" 
when this address space is exhausted (I assume not). Or is the docid field 
recomputed on "optimize"?

I try to add the functionality to see the document id in the response. So for 
now we can close this issue for now.

> Add a field that generates an unique id when you have none in your data to 
> index
> --------------------------------------------------------------------------------
>
>                 Key: SOLR-308
>                 URL: https://issues.apache.org/jira/browse/SOLR-308
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Thomas Peuss
>            Priority: Minor
>         Attachments: GeneratedId.patch
>
>
> This patch adds a field that generates an unique id when you have no unique 
> id in your data you want to index.

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