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https://issues.apache.org/jira/browse/SOLR-14329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17144999#comment-17144999
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Munendra S N commented on SOLR-14329:
-------------------------------------

[~ctargett]
{{cost}} parameter is not specific to collapsing, it can be specified with any 
{{fq}}. That's the reason I haven't documented this in collapse but based on 
the above comment, probably adding link to 
[this|https://lucene.apache.org/solr/guide/8_5/common-query-parameters.html#cache-parameter]
 would be clearer. I will attach patch here in some time for the same
Also, If possible we should cover postFilter in documentation bit more detail

> Add support to choose field for expand component from multiple collapse groups
> ------------------------------------------------------------------------------
>
>                 Key: SOLR-14329
>                 URL: https://issues.apache.org/jira/browse/SOLR-14329
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Munendra S N
>            Assignee: Munendra S N
>            Priority: Major
>             Fix For: 8.6
>
>         Attachments: SOLR-14329.patch
>
>
> SOLR-14073, Fixed NPE issue when multiple collapse groups are specified. 
> ExpandComponent could be used with Collapse but expand only supports single 
> field. So, There should be way to choose collapse group for expand. Low cost  
> collapse group should be given higher priority.



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