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From Alan Woodward <>
Subject Re: Need to reindex when changing schema.xml?
Date Tue, 14 Oct 2014 08:40:56 GMT
You should be able to change it without re-indexing, unless you've enabled docValues on that
field.  AFAIK docValues are the only persistent data structure that is different for single-valued
versus multi-valued, everything else (UninvertedFields, etc) is built on the fly.

I don't think there's any definitive reference on what requires a re-index, but that would
be a nice thing to add to the Reference Guide

Alan Woodward

On 14 Oct 2014, at 08:30, Roger Sindreu wrote:

> Hello
> I hope this question has not been asked many times. I did some research but
> I never could find clearly answered anywhere.
> We have several multivalue fields on a instance with millions of documents
> which only contain a single value. I would like to change it to
> multivalue=false to be able to use grouping and stats on those fields.
> My question is: Can I do it without reindexing?
> Is there any document that says when rebuilding the index is needed versus
> when it is not needed?
> Thanks a lot

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