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https://issues.apache.org/jira/browse/LUCENE-8601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16730028#comment-16730028
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Murali Krishna P commented on LUCENE-8601:
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[^LUCENE-8601.05.patch] which retains the attributes during the merge and
modifies the PerField formats ignore them, has passed the Lucene/Solr QA above.
> Adding attributes to IndexFieldType
> -----------------------------------
>
> Key: LUCENE-8601
> URL: https://issues.apache.org/jira/browse/LUCENE-8601
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Affects Versions: 7.5
> Reporter: Murali Krishna P
> Priority: Major
> Attachments: LUCENE-8601.01.patch, LUCENE-8601.02.patch,
> LUCENE-8601.03.patch, LUCENE-8601.04.patch, LUCENE-8601.05.patch,
> LUCENE-8601.patch
>
>
> Today, we can write a custom Field using custom IndexFieldType, but when the
> DefaultIndexingChain converts [IndexFieldType to
> FieldInfo|https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/index/DefaultIndexingChain.java#L662],
> only few key informations such as indexing options and doc value type are
> retained. The [Codec gets the
> FieldInfo|https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/codecs/DocValuesConsumer.java#L90],
> but not the type details.
>
> FieldInfo has support for ['attributes'|
> https://github.com/apache/lucene-solr/blob/master/lucene/core/src/java/org/apache/lucene/index/FieldInfo.java#L47]
> and it would be great if we can add 'attributes' to IndexFieldType also and
> copy it to FieldInfo's 'attribute'.
>
> This would allow someone to write a custom codec (extending docvalueformat
> for example) for only the 'special field' that he wants and delegate the rest
> of the fields to the default codec.
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