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From David Smiley <>
Subject Re: Support for field removal
Date Mon, 09 Mar 2020 21:34:42 GMT

The main thing missing is that the stored fields data doesn't actually
store what IDs are being used (!).  If that were in place, I could imagine
a CLI tool to purge the IDs.

~ David Smiley
Apache Lucene/Solr Search Developer

On Mon, Mar 9, 2020 at 2:53 PM Michael Kleen <> wrote:

> Hello,
> i am interested in the implementation of the field removal from an index.
> I am a Lucene user and I have a basic understanding of the internals. I
> have a few first questions and I hope this is the right place to ask them.
> Is already someone working on this topic ?
> Are there some real blockers for this feature ?
> From my basic understanding, field removal should work conceptually in the
> following way: The FieldInfo which is supposed to be removed would need to
> be first stored until the segment merge is happening. Once the segment
> merge is happening the field has to excluded from the new segment. Is this
> correct, or do I miss something here ?
> Thank you for your time,
> Michael

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