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https://issues.apache.org/jira/browse/LUCENE-2983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13011123#comment-13011123
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Simon Willnauer commented on LUCENE-2983:
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Committed revision 1085288
> FieldInfos should be read-only if loaded from disk
> --------------------------------------------------
>
> Key: LUCENE-2983
> URL: https://issues.apache.org/jira/browse/LUCENE-2983
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 4.0
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Minor
> Fix For: 4.0
>
> Attachments: LUCENE-2983.patch
>
>
> Currently FieldInfos create a private FieldNumberBiMap when they are loaded
> from a directory which is necessary due to some limitation we need to face
> with IW#addIndexes(Dir). If we add an index via a directory to an existing
> index field number can conflict with the global field numbers in the IW
> receiving the directories. Those field number conflicts will remain until
> those segments are merged and we stabilize again based on the IW global field
> numbers. Yet, we unnecessarily creating a BiMap here where we actually should
> enforce read-only semantics since nobody should modify this FieldInfos
> instance we loaded from the directory. If somebody needs to get a modifiable
> copy they should simply create a new one and all all FieldInfo instances to
> it.
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