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https://issues.apache.org/jira/browse/SOLR-13699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16914711#comment-16914711
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Noble Paul commented on SOLR-13699:
-----------------------------------
You can submit a PR and I can merge it
> 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
> Assignee: Erick Erickson
> Priority: Major
> Attachments: SOLR-13699.patch, SOLR-13699.patch
>
>
> 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, while indexing
> via SolrJ. 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. I am currently not
> sure if this issue is limited to indexing via SolrJ or if it applies to
> documents indexed via any means
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