Hey y'all,

I am confused about when we should supply a new format name (e.g.
Lucene911... vs. Lucene99) versus using a new metadata header version
(incrementing VERSION_CURRENT).

Are there general rules to follow?

At first glance, using a new Lucene format name prefix is functionally the
same as adjusting the metadata header version. Older versions won't be able
to read it. Newer versions will be able to read it and will be able to read
older formats (both named and via metadata versioning).

Thanks!

Ben

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