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https://issues.apache.org/jira/browse/SOLR-8273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15003136#comment-15003136
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Yonik Seeley commented on SOLR-8273:
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bq. Put a WARN-level log message in any code just before it does reinversion.
Although people who are alerting on WARNINGs and do know what they are doing
might not be so happy.
Also, I'm not sure we have the right hooks to do things just before
uninversion... We ask for docValues from the FieldCache / UninvertingReader and
if they exist they will be returned, and if not, the field cache entry will be
built.
> deprecate implicitly uninverted fields, force people to either use docValues,
> or be explicit that they want query time uninversion
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: SOLR-8273
> URL: https://issues.apache.org/jira/browse/SOLR-8273
> Project: Solr
> Issue Type: Improvement
> Reporter: Hoss Man
>
> once upon a time, there was nothing we could do to *stop* people from using
> the FieldCache - even if they didn't realize they were using it.
> Then DocValues was added - and now people have a choice: they can set
> {{docValues=true}} on a field/fieldtype and know that when they do
> functions/sorting/faceting on that field, it won't require a big hunk of ram
> and a big stall everytime a reader was reopened. But it's easy to overlook
> when clients might be doing something that required the FieldCache w/o
> realizing it -- and there is no way to stop them, because Solr automatically
> uses UninvertingReader under the covers and automatically allows every field
> to be uninverted in this way.
> we should change that.
> ----
> Straw man proposal...
> * introduce a new boolean fieldType/field property {{uninvertable}}
> * all existing FieldType classes should default to {{uninvertable==false}}
> * a field or fieldType that contains {{indexed="false" uninvertable="true"}}
> should be an error.
> * the Schema {{version}} value should be incremented, such that any Schema
> with an older version is treated as if every field with {{docValues==false}}
> has an implict {{uninvertable="true"}} on it.
> * the Map passed to UninvertedReader should now only list items that have an
> effective value of {{uninvertable==true}}
> * sample schemas should be updated to use docValues on any field where the
> examples using those schemas suggest using those fields in that way (ie:
> sorting, faceting, etc...)
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