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https://issues.apache.org/jira/browse/LUCENE-1761?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16133669#comment-16133669
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Jeffrey Morlan commented on LUCENE-1761:
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We're trying to migrate from UninvertingReader to DocValues, and from
Legacy*Field to *Point, and this bug is causing searches to fail.
There are many fields that used to have values, but don't any more. Things that
would work fine if the fields were removed completely are failing because of
the old field remnants:
DocValues.get* throws an IllegalStateException (unexpected docvalues type NONE
for field 'foo')
PointRangeQuery throws an IllegalArgumentException (field="foo" was indexed
with numDims=0 but this query has numDims=1)
> low level Field metadata is never removed from index
> ----------------------------------------------------
>
> Key: LUCENE-1761
> URL: https://issues.apache.org/jira/browse/LUCENE-1761
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 2.2, 2.3, 2.3.1, 2.3.2, 2.4, 2.4.1
> Reporter: Hoss Man
> Priority: Minor
> Labels: gsoc2014
> Attachments: LUCENE-1761.patch
>
>
> with heterogeneous docs, or an index whose fields evolve over time, field
> names that are no longer used (ie: all docs that ever referenced them have
> been deleted) still show up when you use IndexReader.getFieldNames.
> It seems logical that segment merging should only preserve metadata about
> fields that actually existing the new segment, but even after deleting all
> documents from an index and optimizing the old field names are still present.
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