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https://issues.apache.org/jira/browse/SOLR-2950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13169377#comment-13169377
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Grant Ingersoll commented on SOLR-2950:
---------------------------------------

Also, I need to double check my comparator understanding b/c perhaps the doc 
ids are off due to getting a top level reader.
                
> QueryElevationComponent needlessly looks up document ids
> --------------------------------------------------------
>
>                 Key: SOLR-2950
>                 URL: https://issues.apache.org/jira/browse/SOLR-2950
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Grant Ingersoll
>            Assignee: Grant Ingersoll
>            Priority: Minor
>             Fix For: 3.6, 4.0
>
>         Attachments: SOLR-2950.patch
>
>
> The QueryElevationComponent needlessly instantiates a FieldCache and does 
> look ups in it for every document.  If we flipped things around a bit and got 
> Lucene internal doc ids on inform() we could then simply do a much smaller 
> and faster lookup during the sort.

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