Chris Troullis commented on SOLR-13699:

Created after discussion with [~erickerickson] on the mailing list. I think I 
have a fix working, just finishing testing and writing a unit test, then I will 
attach my patch.

> maxChars no longer working as designed on CopyField
> ---------------------------------------------------
>                 Key: SOLR-13699
>                 URL: https://issues.apache.org/jira/browse/SOLR-13699
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 7.7, 7.7.1, 7.7.2, 8.0, 8.0.1, 8.1, 8.2, 7.7.3, 8.1.1, 
> 8.1.2
>            Reporter: Chris Troullis
>            Priority: Major
> We recently upgraded from Solr 7.3 to 8.1, and noticed that the maxChars 
> property on a copy field is no longer functioning as designed. Per the most 
> recent documentation it looks like there have been no intentional changes as 
> to the functionality of this property, so I assume this is a bug.
> In debugging the issue, it looks like the bug was caused by SOLR-12992. In 
> DocumentBuilder where the maxChar limit is applied, it first checks if the 
> value is instanceof String. As of SOLR-12992, string values are now coming in 
> as ByteArrayUtf8CharSequence (unless they are above a certain size as defined 
> by JavaBinCodec.MAX_UTF8_SZ), so they are failing the instanceof String 
> check, and the maxChar truncation is not being applied. 

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