[ https://issues.apache.org/jira/browse/LUCENENET-10?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12522169 ] 

Digy commented on LUCENENET-10:
-------------------------------

With Lucene.Net v2.1, IndexWriter has DeleteDocuments method

> Supporting deleteDocuments in IndexWriter
> -----------------------------------------
>
>                 Key: LUCENENET-10
>                 URL: https://issues.apache.org/jira/browse/LUCENENET-10
>             Project: Lucene.Net
>          Issue Type: New Feature
>            Reporter: Nicolas Brel
>         Attachments: IndexWriter.patch
>
>
> Excerpt from the bug submited by Ning Li for Java Lucene: 
> Today, applications have to open/close an IndexWriter and open/close an 
> IndexReader directly or indirectly (via IndexModifier) in order to handle a 
> mix of inserts and deletes. This performs well when inserts and deletes 
> come in fairly large batches. However, the performance can degrade 
> dramatically when inserts and deletes are interleaved in small batches. 
> This is because the ramDirectory is flushed to disk whenever an IndexWriter 
> is closed, causing a lot of small segments to be created on disk, which 
> eventually need to be merged. 
> We would like to propose a small API change to eliminate this problem. We 
> are aware that this kind change has come up in discusions before. See 
> http://www.gossamer-threads.com/lists/lucene/java-dev/23049?search_string=indexwriter%20delete;#23049 

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