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https://issues.apache.org/jira/browse/LUCENE-8601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16725297#comment-16725297
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Michael McCandless commented on LUCENE-8601:
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Hmm, I'm concerned that segment merging may not preserve the attributes.
[~muralikpbhat] could you please add a test case that forces merging? E.g.
index one document with attributes, commit (so it writes a segment), index
another without attributes, commit, and confirm attributes survived?
Can you also update the javadocs to state that if you try to index conflicting
attributes the behavior is undefined (i.e. which attribute wins is undefined).
> 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.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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