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https://issues.apache.org/jira/browse/LUCENE-9617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17235680#comment-17235680
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Michael McCandless commented on LUCENE-9617:
--------------------------------------------
Whoa, good catch [~msfroh]! I'll try to review your PR, thank you.
> FieldNumbers.clear() should reset lowestUnassignedFieldNumber
> -------------------------------------------------------------
>
> Key: LUCENE-9617
> URL: https://issues.apache.org/jira/browse/LUCENE-9617
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 8.7
> Reporter: Michael Froh
> Priority: Minor
> Time Spent: 50m
> Remaining Estimate: 0h
>
> A call to IndexWriter.deleteAll() should completely reset the state of the
> index. Part of that is a call to globalFieldNumbersMap.clear(), which purges
> all knowledge of fields by clearing name -> number and number -> name maps.
> However, it does not reset lowestUnassignedFieldNumber.
> If we have loop that adds some documents, calls deleteAll(), adds documents,
> etc. lowestUnassignedFieldNumber keeps counting up. Since FieldInfos
> allocates an array for number -> FieldInfo, this array will get larger and
> larger, effectively leaking memory.
> We can fix this by resetting lowestUnassignedFieldNumber to -1 in
> FieldNumbers.clear().
> I'll write a unit test and attach a patch.
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