Thank you Paul, I added some comments just so the technical challenges
and risks are clear.

Its unfortunately not so easy to fix...

On Thu, Apr 3, 2014 at 7:49 PM, Paul Smith <[email protected]> wrote:
> Thanks for the JIRA link Robert, I've added a comment to it just to share
> the real world aspect of what happened to us for background.
>
>
> On 1 April 2014 18:29, Robert Muir <[email protected]> wrote:
>>
>> On Tue, Apr 1, 2014 at 2:41 AM, Paul Smith <[email protected]> wrote:
>> >
>> > Thanks Robert for the reply, all of that sounds fairly hairy.  I did try
>> > a
>> > full optimize of the shard index using Luke, but the residual
>> > über-segment
>> > still has the  filed definitions in it.  Are saying in (1) that the
>> > creating
>> > of a new Shard index through a custom call to IndexWriter.addIndexes(..)
>> > would produce a _fully_ optimized index without the fields, and that is
>> > different than what an Optimize operation through ES would call? More a
>> > technical question now on what the differences is between the Optimize
>> > call
>> > and a manual create-new-index-from-multiple-readers.  (I actually though
>> > that's what the Optimize does in practical terms, but there's obviously
>> > more
>> > or less going on under the hood under these different code paths).
>> >
>> > We're going the reindex route for now, was just hoping there was some
>> > special trick we could do a little easier than the above. :)
>> >
>>
>> Optimize and normal merging don't "garbage collect" unused fields from
>> fieldinfos:
>>
>> https://issues.apache.org/jira/browse/LUCENE-1761
>>
>> The addindexes trick is also a forced merge, but it decorates the
>> readers-to-be-merged: lying
>> and hiding the fields as if they don't exist.
>>
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